OPINION

This case involves allegations under the False Claims Act, 31 U.S.C. §§ 3729-33 , that Defendant-Appellee Gilead Sciences, Inc. (Gilead) made false statements about its compliance with Food and Drug Administration (FDA) regulations regarding certain HIV drugs, resulting in the receipt of billions of dollars from the government. Relators Jeff and Sherilyn Campie (rela-tors), two former Gilead employees, allege that these noncompliant drugs were not eligible to receive payment or reimbursement and, therefore, any claims presented to the government for payment were false under the False Claims Act. Relators further allege that Gilead violated the False Claims Act when it fired relator Jeff Cam-pie, who discovered and ultimately reported the violations. See 31 U.S.C. § 3730 (h). The district court dismissed relators’ claims under Federal Rule of Civil Procedure 12(b)(6). It did so before the Supreme Court decided Universal Health Servs., Inc. v. United States (Escobar), — U.S. -, 136 S.Ct. 1989 , 196 L.Ed.2d 348 (2016). We reverse.

I.

Gilead is a large drug producer, with a majority of its prescription drug product sales occurring in the United States. Relevant here, Gilead produces anti-HIV drug therapies, including the drugs Atripla, Truvada, and Emtriva. In 2008 and 2009 alone, the government spent over $5 billion on these anti-retrovirals. Relators claim that in its sale of these drugs to the government, Gilead concealed violations of FDA regulations and knowingly made false statements regarding its regulatory compliance. The facts recited in the rela-tors’ complaints, which are taken as true at-this stage, Escobar, 136 S.Ct. at 1997 , are as follows.

When a drug manufacturer wishes to get a drug approved for manufacture and sale in the United States, it must submit a “new drug application” (NDA) to the FDA, in which it states the chemical composition of a drug and specifies the facilities where it will be manufactured, as well as methods and controls used in the manufacturing process. 21 U.S.C. § 355 (a), (b)(1); 21 C.F.R. § 314.50 (d)(1). Acceptable facilities must meet federal standards, known as “good manufacturing - practices.” See 21 C.F.R. Parts 210, 211. The FDA may refuse an application or withdraw a previously approved application if the methods or facilities “are inadéquate to preserve [the drug’s] identity, strength, quality, and purity.” 21 U.S;C. § 355(d), (e). Once approved, the manufacturer must obtain FDA approval to make major changes to the manufacturing process “before the distribution of the drug” by submitting an application called a Prior Approval Supplement, or PAS. 21 U.S.C. § 356a(c)(2); 21 C.F.R. § 314.70 (b)(3). Both an NDA and PAS require the applicant to certify that all statements in the application are true and agree to comply with all applicable laws and regulations. See Form 356h.

In the mid-2000s, Gilead submitted NDAs and received FDA approval for Em-triva, Truvada, and Atripla. These drugs contain the active ingredient emtricita- bine (commonly known as FTC). In its NDA applications, Gilead represented to the FDA that it would source the FTC from specific registered facilities in Canada, Germany, the United States, and South Korea. But, relators allege that as early as 2006, Gilead contracted with Synthetics China to manufacture unapproved FTC at unregistered facilities. For a period of sixteen months beginning in December 2007, Gilead brought illicit FTC from a Synthetics China facility into the United States to use in its commercial drugs, claiming that the FTC had come from its approved South Korean manufacturer. Gilead allegedly began using Synthetics China to save money and trigger price reduction clauses in contracts with other FTC suppliers.

Gilead ultimately sought approval from the FDA to use Synthetics China’s FTC in October 2008, but according to relators, Gilead had been including products from Synthetics China in its finished drug products for at least two years before this approval was obtained in 2010. Relators also allege that Gilead falsified or concealed data in support of its application to get Synthetics China approved by the FDA. For example, Gilead claims in its application that it had received three full-commercial-scale batches of FTC from Synthetics China that passed testing and were consistent with or equivalent to FTC batches made from existing, approved manufacturers. Relators contend that this representation was false as two of three batches had failed internal testing. One of the batches purportedly contained “residual solvent levels in excess of established limits” and other impurities. A second batch had “microbial contamination” and showed the presence of arsenic, chromium and nickel contaminants. Gilead did not report this to the FDA, but rather secured two new batches from the unapproved Chinese site and amended its PAS on April 24, 2009, to include the substitute data. The FDA approved the amended PAS in May 2009 and the Synthetics China facility was registered in 2010. Gilead also began using FTC from another, unapproved Synthetics China facility, but ultimately stopped using Synthetics China as a supplier in October 2011, following continued contamination issues. Two recalls of contaminated products occurred in 2014.

Gilead never acknowledged or notified the FDA about the bad test results or the contamination and adulteration problems. Despite being aware of manufacturing problems with Synthetics China, Gilead allegedly released 77 lots of FTC produced by Synthetics China to its contract manufacturers before the FDA approval of the Synthetics China facility. Relators allege that the drug products made with FTC affecting the quality and purity of the drug and produced at a different, uninspected manufacturing site are not FDA-approved. And, according to relators, had the FDA been aware of these issues, it would not have approved the use of the Synthetics China manufacturing facility. Relators make a similar argument for the use of unapproved sites in Alberta, Canada to produce ambrisentan, the active ingredient in Letairis, and contamination of tenofovir disoproxil fumarate (a.k.a. Viread), another active ingredient.

Relators insist that Gilead actively concealed its use of illicit FTC products by Synthetics China in a number of ways. First, Gilead imported the FTC through its Canadian facilities and used fraudulent labeling. Second, the labels and paperwork for the FTC were obscured or augmented to conceal where the FTC was actually produced. Third, Gilead credited its approved FTC manufacturers with the production of the Synthetics China FTC. Re-lators allege Gilead’s false statements and fraudulent conduct resulted in government payments both directly, through programs such as the Department of Defense, Department of Veterans Affairs, Federal Bureau of Prisons, USAID, and the Public Health Service, and through reimbursement programs, such as Medicare, Medicaid, TRICARE, FEHBP, and the Ryan White Program. Payment for drugs under these programs is contingent upon FDA approval. See, e.g., 48 C.F.R. § 46.408 (direct payment); 42 U.S.C. § 1396r-8(k)(2)(A)(i) (Medicaid); 42 U.S.C. § 1395w-102(e) (Medicare Part D). Rela-tors allege that because the drugs paid for by the government contained FTC sourced at unregistered facilities, they were not FDA approved and therefore not eligible for payment under the government programs.

Relators further claim that these drugs were “adulterated” or “misbranded” in violation of the law. Congress expressly prohibits any person from introducing or receiving any “adulterated” or “misbranded” drugs in interstate commerce. 21 U.S.C. § 331 (a), (c). A drug is “adulterated” if “the methods used in, or the facilities or controls used for, its manufacture, processing, packing, or holding do not conform to or are not operated or administered in conformity with current good manufacturing practice,” or if “any substance has been (1) mixed or packed therewith so as to reduce its quality or strength or (2) substituted wholly or in part therefor.” 21 U.S.C. § 351 (a)(2)(B), (d). A drug is “mis-branded” if, inter alia, “it is an imitation of another drug,” or “it was manufactured, prepared, propagated, compounded, or processed in an establishment not duly registered” under the Food, Drug, and Cosmetic Act. 21 U.S.C. § 352 (i)(2), (o). Violations of that restriction are crimes and adulterated or misbranded drugs can be seized. 21 U.S.C. §§ 333 (a), 334.

Relators finally raise a retaliation claim regarding the termination of Relator Jeff Campie. See 31 U.S.C. § 3730 (h). Mr. Campie worked at Gilead as its Senior Director of Global Quality Assurance from July 2006 to July 2009. His “regular job duties focused on commercial drug product quality assurance/control issues[, but] he was (based on job requirements) expected to review [active ingredient] submissions as well.” While employed with Gilead, Campie had quality control oversight of (1) all commercially released drug products by Gilead; (2) Gilead’s policies, practices, and good manufacturing practice compliance; and (3) the development of quality systems. It appears that Campie raised concerns about “the integrity of the data being generated to support the release of Gilead drugs” as early as July 2007. In 2008, Campie became worried about Gilead’s use of FTC manufactured by Synthetics China, and in January 2009, convened a meeting to caution Gilead management that FTC could not be shipped from an unapproved manufacturing site. Through the remainder of his employment, “Mr. Campie continued to voice strenuous objections to the false representations and omissions being made to the Government concerning the source and lack of purity of the [active ingredients] from Synthetics China and that [sic] lack of a truthful, valid and approved PAS.” “Although Mr. Campie was supposed to be responsible for commercial quality input on regulatory filings implicating quality or supply issues, Gilead began to selectively circumvent Mr. Campie’s review and effectively removed or excluded him from Gilead’s regulatory review process.” In a March 2009 meeting, “Mr. Campie made clear that he expected Gilead to stop its deceptive practices and threatened to inform the FDA if Gilead continued its fraudulent conduct.” In April 2009, Cam-pie initiated a quarantine to prevent non-approved Letairis from entering the supply chain. That quarantine was lifted and Campie was chastised by management. During this time, Campie continued to voice his concerns.

On June 20, 2009, Campie was informed he would be terminated effective July 2009. He was told that his “heart wasn’t in the job anymore.” Campie maintains, however, that he was terminated because he “discovered, investigated, and raised concerns over Gilead’s release and distribution ... of tons of contaminated and adulterated [active ingredients] that had been manufactured at unregistered and uninspect-ed” facilities and thus “were not eligible for payment under the Government Payment Programs, causing the submission of false claims paid by the [federal] Government and the States.” Upon termination, Campie was asked to sign a severance agreement agreeing not to initiate any claims under the False Claims Act. He refused.

The district court dismissed relators’ first amended complaint on January 7, 2015, under Federal Rule of Civil Procedure 12(b)(6) for failure to state a claim, but gave relators an opportunity to amend. On June 12, 2015, the district court dismissed relators’ second amended complaint with prejudice, holding that it also failed to state a claim under the False Claims Act. Relators timely appealed. Although it declined to intervene in the case below, the United States Department j of Justice submitted a brief as amicus curiae supporting reversal of the district court.

II.

We have jurisdiction pursuant to 28 U.S.C. § 1291 . We review the dismissal of claims under the False Claims Act de novo. United States ex rel. Hendow v. Univ. of Phx., 461 F.3d 1166, 1170 (9th Cir. 2006). We assume the facts as alleged are true and examine only whether rela-tors’ allegations support a cause of action under the False Claims Act under the ' theories presented. Id. A Rule 12(b)(6) dismissal “can be based on a lack of a cognizable legal theory or the absence of sufficient facts alleged under a cognizable legal theory.” Balistreri v. Pacifica Police Dep’t, 901 F.2d 696, 699 (9th Cir. 1990). A complaint must plead “sufficient factual matter, accepted as true, to ‘state a claim to relief that is plausible on its face.’” Ashcroft v. Iqbal, 556 U.S. 662, 678 , 129 S.Ct. 1937 , 173 L.Ed.2d 868 (2009) (quoting Bell Atl. Corp. v. Twombly, 550 U.S. 544, 570 , 127 S.Ct. 1955 , 167 L.Ed.2d 929 (2007)). A claim under the False Claims Act must not only be plausible, Fed. R. Civ. P. 8(a), but pled with particularity under Rule 9(b), Cafasso ex rel. United States v. Gen. Dynamics C4 Sys., Inc., 637 F.3d 1047, 1054-55 (9th Cir. 2011). The district court based its dismissal on Rule 12(b)(6) and did not address whether the relators’ complaints met Rule 9(b)’s heightened pleading standard.

III.

The False Claims Act makes liable anyone who “knowingly presents, or causes to be presented, a false or fraudulent claim for payment or approval,” or “knowingly makes, uses, or causes to be made or used, a false record or statement material to a false or fraudulent claim.” 31 U.S.C. § 3729 (a)(1)(A), (B). A “claim” includes direct requests for government payment as well as reimbursement requests made to the recipients of federal funds under a federal benefits program. 31 U.S.C. § 3729 (b)(2)(A); Escobar, 136 S.Ct. at 1996 . A claim under the False Claims Act requires a showing of “(1) a false statement or fraudulent course of conduct, (2) made with the scienter, (3) that was material, causing (4) the government to' pay out money or forfeit moneys due.” Hendow, 461 F.3d at 1174 . It is not enough to allege regulatory violations, United States ex rel. Hopper v. Anton, 91 F.3d 1261, 1266 (9th Cir. 1996); rather, the false claim or statement must be the “sine qua non of receipt of state funding,” Ebeid ex rel. United States v. Lungwitz, 616 F.3d 993, 998 (9th Cir. 2010). We construe the Act broadly, as it is “intended to reach all types of fraud, without qualification, that might result in financial loss to the Government.” Hendow, 461 F.3d at 1170 (quoting United States v. Neifert-White Co., 390 U.S. 228, 232 , 88 S.Ct. 959 , 19 L.Ed.2d 1061 (1968)). Such broad construction has thus given rise to a number of doctrines “that attach potential False Claims Act liability to claims for payment that are not explicitly and/or independently false.” Hendow, 461 F.3d at 1171 .

Relators insist that Gilead’s claims seeking payment for noncompliant drugs are a basis for liability under the False Claims Act for three reasons. First, Gilead charged the government for approved drugs, knowing that it had delivered unapproved “knock-offs” (factually false certification). Second, by selling its drugs to the government and causing others to seek reimbursement for them, Gilead implicitly certified that the drugs were approved for distribution when it knew otherwise (implied false certification). Third, Gilead lied to the FDA to secure approval of Chinese facilities, making them eligible for government payments (promissory fraud). The district court below rejected all three of relators’ theories for recovery under the False Claims Act. First, the district court rejected relators’ formulation of á factually false theory based on the provision of nonconforming goods. As to relators’ second and third arguments, the district court recognized claims brought under either an implied false certification or promissory fraud theory could be viable, but concluded that relators failed to state a claim under either one because they failed to allege Gilead made a false statement related to a material precondition for payment. The United States, while not taking a position on the merits of relators’ claims, identifies in its amicus briefing two rulings by the district court as particularly significant to the government. First, it argues that the district court’s dismissal of relators’ nonconforming goods theory improperly limits liability under the False Claims Act. Second, it argues that the district court improperly rejected a promissory fraud theory where the fraud was initially directed at a non-payor agency. We address each of the relevant theories for recovery under the False Claims Act and conclude that relators state a plausible claim.

A. Factually False Certification

Relators insist that Gilead’s HIV drugs were not manufactured at an approved facility and thus were not approved by the FDA, and therefore Gilead’s sale of those medicines, and attendant receipt of government payments, constituted a material false statement. Although the district court analyzed this claim in part as a failed claim for worthless services, United States ex rel. Lee v. SmithKline Beecham, Inc., 245 F.3d 1048, 1053 (9th Cir. 2001), the claim is one of nonconforming goods, United States v. Nat’l Wholesalers, 236 F.2d 944, 950 (9th 1956); see United States ex rel. Wilkins v. United Health Group, Inc., 659 F.3d 295, 305 (3d Cir. 2011) (“A claim is factually false when the claimant misrepresents what goods or services that it provided to the Government....”). The value of the goods at issue is dispositive under the first characterization, Lee, 245 F.3d at 1053-54 , and immaterial to the latter, Nat’l Wholesalers, 236 F.2d at 949-51 (finding a violation of the False Claims Act despite substitute goods of “equal” performance); United States v. Aerodex, Inc., 469 F.2d 1003, 1007-08 (5th Cir. 1972) (“The mere fact that the item supplied under contract is as good as the one contracted for does not relieve defendants of liability if it can be shown that they attempted to deceive the government agency.”). Although rela-tors failed to allege that the drugs paid for by the government were “worthless,” that failure does not affect relators’ claim for nonconforming goods.

In National Wholesalers, a wholesaler contracted with the United States to furnish proprietary engine regulators but instead delivered regulators manufactured by the wholesaler bearing spurious proprietary labels. 236 F.2d at 945—47. Even though the substitute regulators functioned equally to those contracted for, we found liability under the False Claims Act because the wholesaler “misbrand[ed]” the substitutes to make them appear to be the genuine article. Id. at 950. The Fifth Circuit reached a similar conclusion in Aerodex, where the defendants sold the United States Navy engine bearings different from the ones contracted for, admitting that they both reworked and renumbered the bearings to appear compliant with their contract. 469 F.2d at 1007 . Despite the fact that the bearings provided were also approved for use in the engines at issue, the Fifth Circuit found liability under the False Claims Act due to the defendant’s deliberate mislabeling. Id. at 1007-08 .

Contrary to the position taken by Gilead, a claim for nonconforming goods is not limited to situations where there is an express specification in a payment contract between a supplier and the government regarding the disputed aspect of the product to be supplied. Such a circumscribed view of False Claims Act liability was expressly rejected by the Supreme Court in Escobar, 136 S.Ct. at 2001 , a case decided after the district court had ruled in this case. Additionally, as we have previously explained, the False Claims Act “was enacted during the Civil War with the purpose of forfending widespread fraud by government contractors who were submitting inflated invoices and shipping faulty goods to the government.” Hopper, 91 F.3d at 1265-66 . That core purpose would not be served if a defendant could escape liability for delivering nonconforming goods merely because the goods retained some value or in the absence of a bilateral contract. It is fraudulent conduct that gives rise to liability, regardless of whether the underlying relationship is based in contract, regulation, or statute. Nat’l Wholesalers, 236 F.2d at 950 .

As we have previously held, the provision of nonconforming goods can be a basis of liability under the False Claims Act. See Hopper, 91 F.3d at 1266 (citing Aerodex for proposition that “[False Claims Act] actions have also been sustained under theories of supplying substandard products or services”). But, unlike the situation in Lee, where a claim for medically “worthless” drugs does not require a showing of “false certification,” 245 F.3d at 1053 , a claim for nonconforming goods must include an intentionally false statement or fraudulent course of conduct that was material to the government’s decision to pay, Nat'l Wholesalers, 236 F.2d at 950 .

B. Implied False Certification

Claims under an implied false certification theory can also be viable under the False Claims Act. Escobar, 136 S.Ct. at 1999 . Under such a theory, “when a defendant submits a claim, it impliedly certifies compliance with all conditions of payment. But if the claim fails to disclose the defendant’s violation of a material statutory, regulatory, or contractual requirement ... the defendant has made a misrepresentation that renders the claim ‘false or fraudulent’ under § 3729(a)(1)(A).” Id. at 1995. In Escobar, the Supreme Court recently “clarified] some of the circumstances in which the False Claims Act imposes liability” under this theory. Id. As pointed out above, the district court did not have the benefit of Escobar in making its decision.

■ In Escobar, parents brought suit following the death of their daughter after she was treated at a mental health clinic by various unlicensed and unsupervised staff in violation of state Medicaid regulations. Id. at 1997. The operative complaint asserted that the healthcare provider “submitted reimbursement claims that made representations about the specific services provided by specific types of professionals, but that failed to disclose serious violations of regulations pertaining to staff qualifications and licensing requirements for those services.”- Id. at 1997-98 (footnote omitted). The state Medicaid program, “unaware of these deficiencies, paid the claims.” Id. at 1998. The Court concluded that “by submitting claims for payment using payment codes that corresponded to specific counseling services, [the healthcare provider] represented that it had provided individual therapy, family therapy, preventive medication counseling, and other types of treatment.” Id. at 2000. Moreover, staff members “submitt[ed] Medicaid reimbursement claims by using National Provider Identification numbers corresponding to specific job titles. And these representations were clearly misleading in context.” Id.

The Supreme Court held that although the implied certification theory can be a basis for liability, two conditions must be satisfied. Id. at 2000. First, the claim must not merely request payment, but also make specific representations about the goods or services provided. Id. Second, the defendant’s failure to disclose noncompliance with material statutory, regulatory, or contractual requirements must “make[ ] those representations misleading half-truths.”- Id. at'2001 (footnote omitted). The violation need not be of a contractual, statutory, or regulatory provision -that the Government expressly designated as a condition of payment. Id. However, the misrepresentation must be “material to the Government’s payment decision.” Id. at 2002. Although Escobar clarifies the conditions upon which an implied false certification claim can be made, the four essential elements identified above remain the same. See Hendow, 461 F.3d at 1174 ; see also United States ex rel. Kelly v. Serco, Inc., 846 F.3d 325, 332-33 (9th Cir. 2017) (applying Escobar to former employee of a defense contractor alleging that his employer’s submission of vouchers constituted a false certification of work performed under a contract).

C. Promissory Fraud

Another approach to finding liability under the False Claims Act in the absence of an explicitly false claim is the “promissory fraud” or “fraud-in-the-indueement” theory. Hendow, 461 F.3d at 1173 . Under this theory, “liability will attach to each claim submitted to the government under a contract, when the contract or extension of the government benefit was originally obtained through false statements or fraudulent conduct.” Id. “In other words, subsequent claims are false because of an original fraud (whether a certification or otherwise).” Id. The elements of a claim for promissory fraud are very similar to those necessary for an implied false certification claim, requiring a false claim wherein the falsity is knowingly perpetrated and the underlying fraud is material to the government’s decision to pay. Id. at 1174 .

D. Elements

Under all three theories the essential elements of False Claims Act liability are: (1) a false statement or fraudulent course of conduct, (2) made with scienter, (3) that was material, causing (4) the government to pay out money or forfeit moneys due. Escobar, 136 S.Ct. at 2000-02 ; Nat’l Wholesalers, 236 F.2d at 950 ; Hendow, 461 F.3d at 1174 . Here, the dispute focuses primarily on the first and third elements, falsity and materiality. The district court rejected relators’ claims for a number of reasons, including that the fraud was directed at the FDA, not the payor agency; payment was not conditioned on compliance with FDA regulations, but merely FDA approval; and the False Claims Act was not meant to intrude on the FDA’s complex regulatory regime.

1. Falsity

The first requirement of a False Claims Act claim is a false claim. Hendow, 461 F.3d at 1171 ; Hopper, 91 F.3d at 1266 (“Violations of laws, rules, or regulations alone do not create a cause of action. It is the false certification of compliance which creates liability when certification is a prerequisite to obtaining a government benefit.”). Relators allege a false claim here.

a. Factually false certification

Relators have adequately satisfied the falsity requirement under a theory of factually false certification. As in National Wholesalers, Gilead committed factually false certification by supplying “mis-brand[ed]” goods. 236 F.2d at 950 . Specifically, Gilead represented to the FDA that its active ingredients had been manufactured in approved facilities that had been registered therewith.

b. Implied false certification

Relators have also adequately satisfied the falsity requirement under a theory of implied false certification. To succeed on such a claim, pursuant to National Wholesalers and Escobar, Gilead must not merely request payment, but also make specific representations about the goods or services provided. Escobar, 136 S.Ct. at 2000 ; Nat’l Wholesalers, 236 F.2d at 950 . Here, relators allege that by submitting claims for payment or reimbursement for Truvada, Emtriva, and Atripla, Gilead represented that it provided medications approved by the FDA that were manufactured at approved facilities and were not adulterated or misbranded. Just as payment codes correspond to specific health services, Escobar, 136 S.Ct. at 2000 , and proprietary labels indicate that engine regulators are a proprietary design, Nat’l Wholesalers, 236 F.2d at 950 , these drug names necessarily refer to specific drugs under the FDA’s regulatory regime. Esco-bar further requires that Gilead’s failure to disclose noncompliance with material statutory, regulatory, or contractual requirements must “make[ ] those representations misleading half-truths.” 136 S.Ct. at 2000 (footnote omitted). Setting aside the question of materiality, relators allege Gilead’s representations were misleading in this context because Gilead acquired unapproved FTC from a Chinese supplier, relabeled it to conceal its true nature, falsified test results that showed it was contaminated, and then used that unapproved and contaminated FTC in drugs for which payment was requested and received. Although the drugs at issue were at all times ostensibly “FDA approved,” relators allege Gilead requested payment for drugs that fell outside of that approval and omitted critical information regarding compliance with FDA standards.

The district court rejected relators’ claims in part because the alleged fraud was directed at the FDA, not the payor agency. That concern is factually assuaged to some degree for the purposes of this case in that both the FDA and the Center for Medicare & Medicaid Services (CMS) (the primary payor agency for reimbursement claims) are overseen by the Secretary of Health and Human Services. Therefore, the fraud was, at all times, committed against the Department of Health and Human Services. But more importantly, the False Claims Act imposes no such limitation. See 31 U.S.C. § 3729 (a)(1)(B) (extending liability to those who cause false statements to be used). It is not the distinction between the agencies that matters, but rather the connection between the regulatory omissions and the claim for payment. See United States ex rel. Petratos v. Genentech Inc., 855 F.3d 481, 492 (3d Cir. 2017) (“[O]ur focus here should not be whether the alleged fraud deceived the prescribing physicians, but rather whether it affected CMS’s payment decision.”). As we stated in Hendow, “if a false statement is integral to a causal chain leading to payment, it is irrelevant how the federal bureaucracy has apportioned the statements among layers of paperwork.” 461 F.3d at 1174 . Hendow itself involved false statements submitted to the Department of Education where claims were submitted to private lenders. Id. at 1169-80 ; see also, e.g., United States ex rel. Duxbury v. Ortho Biotech Products, L.P., 579 F.3d 13, 29-30 (1st Cir. 2009) (alleging defendant’s fraud caused medical providers to submit false claims); Hutcheson, 647 F.3d at 378 (similar). Moreover, relators allege that in addition to making a number of false and fraudulent statements to the FDA, Gilead’s submission of alleged unapproved and noncompliant drugs to the pay- or agencies was itself an alleged false certification. Escobar, 136 S.Ct. at 2000 .

The district court also rejected relators’ claims because payment was not “conditioned on the falsity.” As made clear in Escobar, “ ‘[IJnstead of adopting a circumscribed view of what it means for a claim to be false or fraudulent,’ concerns about fair notice and open-ended liability ‘can be effectively addressed through strict enforcement of the Act’s materiality and scienter requirements.’ ” 136 S.Ct. at 2002 (quoting United States v. Science Applications Int’l Corp., 626 F.3d 1257, 1270 (D.C. Cir. 2010)). We therefore address the district court’s concern in the context of materiality.

Gilead insists its certification was not “false” pursuant to United States ex rel. Rostholder v. Omnicare, Inc., 745 F.3d 694, 701-02 (4th Cir. 2014). In Omnicare, the Fourth Circuit concluded that

745 F.3d at 701-02 . In Omnicare, the relator alleged only regulatory violations, not a false claim. Id. Although we rejected a regulatory violation claim in Hopper, 91 F.3d at 1265-67 , we have since clarified that the “fatal defect” in that case “was not that the claimed infraction was a regulatory violation, but that there was a ‘lack of a false claim,’ ” Hendow, 461 F.3d at 1171 ; see also Kelly, 846 F.3d at 333 (finding no evidence of a “false claim” where dispute was over format of cost reports). Here, relators allege false statements permeating the regulatory process. They allege Gilead mislabeled and misbranded nonconforming drugs and misrepresented its compliance with FDA regulations by omitting critical information. They allege that Gilead established policies and practices to violate the FDA’s regulatory requirements and allege specific instances of such violations, such as altering inventory codes, and mislabeling or altering shipping and tracking information. ‘ All the while, Gilead was submitting claims for payment for “FDA approved” drugs. Moreover, they allege that Gilead made false statements regarding test results in order to get FDA approval and thus become eligible for government funds. As was the case in Escobar, “[t]he claims in this case do more than merely demand payment. They fall squarely within the rule that half-truths — representations that state the truth only so far as it goes, while omitting critical qualifying information — can be actionable misrepresentations.” 136 S.Ct. at 2000 (footnote omitted). Relators adequately plead falsity under the False Claims Act. To hold otherwise would reduce FDA regulations akin to approval of the curate’s egg.

c. Promissory fraud

Finally, relators have adequately satisfied the falsity requirement under a theory of promissory fraud. Because Gilead committed either factually false or impliedly false certification through its representations to the FDA and labeling of its products, see supra, each claim was fraudulent even if false representations were not made therein. See Hendow, 461 F.3d at 1173 .

2. Scienter

Had Gilead accidentally produced adulterated pills and unwittingly shipped them and requested payment from the government, the intent requirement under the False Claims Act would not be met. That is not the case. Relators allege a false statement or course of conduct made knowingly and intentionally. See 31 U.S.C. § 3729 (b)(1). They allege Gilead took internal actions perpetuating its fraud: altering test results, batch numbers, and Inventory Control Numbers, and representing that nonapproved FTC came from approved facilities. They also allege Gilead established practices to deceive the government, and repeatedly took actions to hide its fraud. In other words, relators allege Gilead provided statements to the government that were “intentional, palpable lie[s],” made with “knowledge of the falsity and with intent to deceive.” Hopper, 91 F.3d at 4265, 1267 . The scienter element is adequately pled.

3. Materiality

Under the False Claims Act, a falsehood is material if it has “a natural tendency to influence, or be capable of influencing, the payment or receipt of money or property.” 31 U.S.C. § 3729 (b)(4). In Escobar, the Supreme Court clarified that “[t]he materiality standard is demanding.” 136 S.Ct. at 2003 . “A misrepresentation cannot be deemed material merely because the Government designates compliance with a particular statutory, regulatory, or contractual requirement of payment. Nor is it sufficient for a finding of materiality that the Government would have the option to decline to pay if it knew of the defendant’s noncompliance.” Id. Materiality also “cannot be found where noncompliance is minor or insubstantial.” Id. Proof of materiality can include whether “the Government pays a particular claim in full despite its actual knowledge that certain requirements were violated.” Id.

FDA approval is the “the sine qua non” of federal funding here. Hendow, 461 F.3d at 1176 . Eligibility for federal funding and reimbursement is conditioned on FDA approval under Medicaid, 42 U.S.C. § 1396r-8 (limited to “covered outpatient drug,” which is defined as “approved for safety and effectiveness as a prescription drug” by the FDA), Medicare, 42 U.S.C. § 1395w-102e (similar), and the direct payment programs identified by relators,. 48 C.F.R. § 46.408 (assigning FDA responsibility for ensuring quality of drugs purchased by agencies). All of these payment programs look to FDA-approval as a determination of the “safety and effectiveness” of the drugs at issue. It is undisputed that at all times relevant, the drugs at issue were FDA-approved, and that the government continues to make direct payments and provide reimbursements for the sale of the three drugs. Relators thus face an uphill battle in alleging materiality sufficient to maintain their claims.

We note that other courts have cautioned against allowing claims under the False Claims Act to wade into the FDA’s regulatory regime. See Omnicare, 745 F.3d at 702-03 ; D’Agostino v. ev3, Inc., 845 F.3d 1, 9 (1st Cir. 2016); Petratos, 855 F.3d at 490 . However, just as it is not the purpose of the False Claims Act to ensure regulatory compliance, it is not the FDA’s purpose to prevent fraud on the government’s fisc. Mere FDA approval cannot preclude False Claims Act liability, especially where, as here, the alleged false claims procured certain approvals in the first instance. A conclusion to the contrary would not be consistent with Escobar:

136 S.Ct. at 1999 . The dispositive question is rather one of materiality, which turns on a number of factors:

Id. at 2003-04 .

Here, Gilead insists that because the government continued to pay for the medications after it knew of the FDA violations, those violations were not material to its payment decision. Relators outline a variety of facts that speak to the government’s knowledge, such as a September 2010 warning letter regarding impurities in the form of black specks and spots, a June/July 2012 inspection and noncompliance letter regarding product from Synthetics China, December 2012 and July 2013 inspections of a specific facility, and two recalls that took place in 2014. Gilead’s argument is premised on the continued FDA approval of the drugs even after the agency became aware of certain noncompliance.

Relators and the United States persuasively argue, however, that to read too much into the FDA’s continued approval— and its effect on the government’s payment decision — would be a mistake. First, to do so would allow Gilead to use the allegedly fraudulently-obtained FDA approval as a shield against liability for fraud. Second, as argued by Gilead itself, there are many reasons the FDA may choose not to withdraw a drug approval, unrelated to the concern that the government paid out billions of dollars for nonconforming and adulterated drugs. Third, unlike Kelly, where the government continued to accept noncompliant vouchers, 846 F.3d at 334 , Gilead ultimately stopped using FTC from Synthetics China. Once the unapproved and contaminated drugs were no longer being used, the government’s decision to keep paying for compliant drugs does not have the same significance as if the government continued to pay despite continued noncompliance. In making its argument, Gilead specifically cites to Petratos, where the Third Circuit concluded the materiality standard was not met where the relator did “not dispute that CMS would reimburse these claims even with full knowledge of the alleged reporting deficiencies.” 855 F.3d at 490 . Beside the fact that the relator in Petratos did not allege regulatory or statutory violations, id. (“Petratos does not claim that [the defendant’s safety-related reporting violated any statute or regulation.”), no such concession is made here. Rather, the parties dispute exactly what the government knew and when, calling into question its “actual knowledge.” Although it may be that the government regularly pays this particular type of claim in full despite actual knowledge that certain requirements were violated, such evidence is not before us.

The issues raised by the parties here are matters of proof, not legal grounds to dismiss relators’ complaint. See Kelly, 846 F.3d at 334 (concluding relator “failed to establish a genuine issue of material fact regarding [ ] materiality”). And, other statutes regulating “adulterated” and “mis-branded” drugs reinforce the idea that violations of the FDA regulatory regime have ramifications beyond FDA enforcement actions. See 21 U.S.C. § 331 ; see, e.g., United States v. Marcus, 82 F.3d 606, 610 (4th Cir. 1996) (upholding criminal liability for manufacturer’s undisclosed addition of two inactive pharmaceutical ingredients not included in FDA-approved NDA given then-unknown effect on safety and efficacy of the drug product).

In sum, relators allege more than the mere possibility that the government would be entitled to refuse payment if it were aware of the violations, Kelly, 846 F.3d at 334 , sufficiently pleading materiality at this stage of the case.

4. Claim

Relators allege Gilead submitted false claims in a number of ways, including submitting direct requests for payment from government agencies, as well as submitting requests for reimbursement. Those allegations are sufficient under the False Claims Act. Hendow, 461 F.3d at 1177 .

Ultimately, relators have alleged sufficient facts under the False Claims Act to state a claim for relief that is plausible on its face. Fed. R. Civ. P. 8(a); Ashcroft, 556 U.S. at 678 , 129 S.Ct. 1937 . We do not reach whether that claim is alleged with sufficient particularity to meet the requirements of Rule 9(b), as that question was not addressed by the district court.

IV.

Relator Jeff Campie also alleges Gilead retaliated against him in violation of the False Claims Act. 31 U.S.C. § 3730 (h). To state a claim for retaliation, a plaintiff must demonstrate that: (1) he “engaged in activity protected under the statute”; (2) the employer knew the plaintiff engaged in a protected activity; and (3) the employer discriminated against the plaintiff “because he ... engaged in protected activity.” Mendiondo v. Centinela Hosp. Med. Ctr., 521 F.3d 1097, 1103 (9th Cir. 2008) (holding that the heightened pleading requirements of Rule 9(b) do not apply). The district court dismissed Campie’s retaliation claim, holding that he failed to show either that he was engaged in a protected activity or that Gilead had notice of such activities. We reverse.

A. Protected Activity

An employee engages in a protected activity by “‘investigating matters which are calculated or reasonably could lead to a viable [False Claims Act] action.’” Moore v. Cal. Inst. of Tech. Jet Propulsion Lab., 275 F.3d 838, 845 (9th Cir. 2002) (quoting Hopper, 91 F.3d at 1269 ). The district court relied extensively on Hopper to conclude that because Cam-pie’s allegations are consistent with an in vestigation into regulatory noncompliance — as opposed to an effort to uncover fraud against the government — he failed to show he engaged in a protected activity. See 91 F.3d at 1263-65 . However, in Moore we subsequently clarified “that an employee engages in protected activity where (1) the employee in good faith believes, and (2) a reasonable employee in the same or similar circumstances might believe, that the employer is possibly committing fraud against the government.” 275 F.3d at 845-46 (footnote omitted). The Second Amended Complaint sufficiently alleges facts showing that Campie had an objectively reasonable, good faith belief that Gilead was possibly committing fraud against the government.

B. Notice

It is not enough for relators to allege that Jeff Campie was engaged in a protected activity; they must also show that Gilead knew Campie was engaged in such activity. Mendiondo, 521 F.3d at 1103 ; Hopper, 91 F.3d at 1269 . As made clear in Mendiondo , an allegation of knowledge is not a high bar:

521 F.3d at 1104 . Here, the Second Amended Complaint alleges Campie was told it was “none of his concern” when he discussed contamination and adulteration problems on multiple occasions, and he was asked to sign a severance agreement stating he would not bring a False Claims Act claim. Further, “Mr. Campie explicitly complained that Gilead was violating FDA regulations in order to sell its drugs to the Government and States notwithstanding their lack of compliance with [regulatory requirements].... ” These allegations are sufficient under Mendiondo .

That said, as noted by the district court, the monitoring and reporting activities outlined by relators are by-and-large the types of activities Campie was required to undertake as part of his job. Courts have held that when an employee is tasked with such investigations, it takes more than an employer’s knowledge of that activity to show that an employer was on notice of a potential qui tarn suit. See United States ex rel. Ramseyer v. Century Healthcare Corp., 90 F.3d 1514, 1523 (10th Cir. 1996) (holding retaliation allegation insufficient where plaintiffs job duties entailed the monitoring and reporting activities at issue); see also Robertson v. Bell Helicopter Textron, Inc., 32 F.3d 948, 952 (5th Cir. 1994) (concluding that relator failed to rebut defendant’s trial testimony regarding lack of knowledge).

Although Ramseyer is instructive, it is distinct from this case. First, the plaintiff in Ramseyer “gave no suggestion that she was going to report [the] noncompliance to government officials.” 90 F.3d at 1523 . Here, the Second Amended Complaint alleges that “Mr. Campie made clear that he expected Gilead to stop its deceptive practices and threatened to inform the FDA if Gilead continued its fraudulent conduct.” Second, Campie alleges he was “selectively circumvent[ed]” and “excluded]” from the regulatory review process in which he was meant to take part, was told certain regulatory compliance actions, such as issuing a quarantine, were “not in his job description,” and had conversations outside of his chain of command regarding his concerns. The Second Amended Complaint alleges sufficient facts to show Gilead knew of Campie’s protected activity.

C. Causation

Finally, relators’ pleading must show that Gilead discriminated against Mr. Campie “because he [ ] engaged in protected activity.” Mendiondo, 521 F.3d at 1104 . It is sufficient at the pleading stage for the plaintiff “to simply give notice that []he believes [the defendant] terminated h[im] because of h[is] investigation into the practices [] specified in the complaint.” Id. Although the district court did not address this requirement because it found the operative complaint insufficient under the first two requirements, such a showing has been made here.

Based on the forgoing, the retaliation claim included in the Second Amended Complaint contains sufficient facts to survive dismissal under Rule 12(b)(6).

V.

Relators plead sufficient factual allegations to state a claim under the False Claims Act. Because the district court did not address whether relators’ claims pursuant to 31 U.S.C. § 3729 (a)(1)(A), (B) meet the heightened pleadings standard under Rule 9(b), we decline to decide that question in the first instance.

REVERSED AND REMANDED.

. The term "active ingredient” refers to the biologically active component of a drug, i.e., any "component that is intended to furnish pharmacological activity or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease, or to affect the structure of any function of the body..” 21 C.F.R. § 210.3 (b)(7). . In addition to using the term FTC, relators use the term "API” to refer to "active pharmaceutical products” throughout their complaints. To avoid confusion, this opinion uses only the term FTC. . The parallel state claims were dismissed without prejudice. . Although the Supreme Court admonished in Escobar that "[t]he False Claims Act is not ‘an all-purpose antifraud statute,’ or a vehicle for punishing garden variety breaches of contract or regulatory violations,” 136 S.Ct. at 2003 (quoting Allison Engine Co. v. United States ex rel. Sanders, 553 U.S. 662, 672 , 128 S.Ct. 2123 , 170 L.Ed.2d 1030 (2008) (citation omitted)), this instruction related only to the "demanding” materiality requirement of a False Claims Act claim, see id., and therefore did not displace this court’s obligation to construe broadly any theory of liability in which materiality can be proven. . Payment can also be conditioned on other aspects of the drug not regulated by the FDA, such as whether the product is "reasonable and necessary” under Medicare. See 42 U.S.C. § 1395y(a)(l)(A). . The district court focused extensively on the difference between NDA-approval and PAS-approval, ultimately concluding NDA-approval was the sole condition of payment. That distinction is not persuasive post-Escobar. See 136 S.Ct. at 1999 . : In D’Agostino , the First Circuit went as far as to conclude that "[t]he FDA’s failure actually to withdraw its approval of [a medical device] ... precludes [the relator] from resting his claims on a contention that the FDA’s approval was fraudulently obtained” and that "the absence of some official agency action confirming its position and judgment in accordance with the law renders [a relatorfs fraud-on-the-FDA theory futile.” 845 F.3d at 9 . . Take the hypothetical posed by relators: if a reimbursement request was submitted for 10 pills of Atripla, but Gilead actually provided 10 pills of Tylenol, that request for payment would be undeniably false. Even though Tylenol is FDA approved, it is not what the government paid for. . In D’Agostino , the First Circuit highlighted the "[practical problems of proof” in how a relator would show that the FDA would not have granted approval but for the fraudulent representations. 845 F.3d at 9 . That concern is exactly that: a problem of proof. At the pleading stage we assume the facts alleged by the relators to be true. Hendow, 461 F.3d at 1170 .