The Federal Law Peptide Sellers Should Read: False Advertising Under 15 U.S.C. 52 and 55 (2026)

15 U.S.C. 52(a) states that it shall be unlawful for any person, partnership, or corporation to disseminate, or cause to be disseminated, any false advertisement (REG-059). 15 U.S.C. 55(a)(1) contains the phrase "misleading in a material respect" (REG-062). This guide quotes 30 ledger entries from sections 52, 55 and 21 U.S.C. 321, retrieved on 2026-10-08.

Updated October 28, 2026.

What does this guide cover?

The FTC Health Products Compliance Guidance page could not be read on 2026-10-08, so this guide rests on the statutory text it quotes (REG-058). Section 52 makes it unlawful to disseminate false advertisements (REG-059), and section 321 lists the drug definition wording (REG-001). In plainer words, the guide reports what the statutes say, quoted from the captured text (REG-059, REG-001). The guide does not report FTC enforcement history, penalties or substantiation standards, because the sources captured for this guide do not quote them. Read the quoted statutory text in the tables below before applying it to your own advertising.

What does 15 U.S.C. 52(a) make unlawful?

Section 52(a) makes it unlawful to disseminate, or cause to be disseminated, any false advertisement (REG-059). The statute states that it shall be unlawful for any person, partnership, or corporation to disseminate, or cause to be disseminated, any false advertisement (REG-059). In plainer words, the statute speaks of any person, partnership, or corporation (REG-059). The text goes on to cite dissemination by United States mails, or in or having an effect upon commerce, by any means, for the purpose of inducing (REG-164). Check where and how your own advertising is disseminated against this wording.

The statute names food, drugs, devices, services, or cosmetics in connection with advertisements likely to induce a purchase (REG-060). Section 52(a)(1) uses the phrase "which is likely to induce, directly or indirectly the purchase of food, drugs, devices, services, or cosmetics" (REG-060). In plainer words, the phrase covers advertisements likely to induce, directly or indirectly, the purchase of those items (REG-060). Subsection (a) states the purpose language again as "By any means, for the purpose of inducing, or which is likely to induce, directly or indirectly, the purchase in or having an effect upon commerce, of food, drugs, devices, services, or cosmetics." (REG-165) In plainer words, subsection (a) repeats the purpose language and adds the phrase in or having an effect upon commerce (REG-165). Compare the products you advertise with the categories the statute names.

How does 52(b) connect false advertising to section 45?

Section 52(b) makes the dissemination of a false advertisement under subsection (a) an unfair or deceptive act or practice within the meaning of section 45 of title 15 (REG-061). The subsection states that dissemination of a false advertisement within the provisions of subsection (a) shall be an unfair or deceptive act or practice in or affecting commerce within the meaning of section 45 of title 15 (REG-061). In plainer words, a false advertisement within subsection (a) is classed as an unfair or deceptive act or practice (REG-061). The sources captured for this guide do not quote section 45 itself, so this guide says nothing about what follows from that cross reference. Read section 45 itself before relying on this cross reference.

How 15 U.S.C. 52(b) links false advertising to section 45

Lookup table: section 52 phrases and their verbatim text

Section 52 makes it unlawful to disseminate false advertisements (REG-059), by United States mails or in or having an effect upon commerce, by any means, for the purpose of inducing (REG-164). It covers advertisements likely to induce, directly or indirectly, the purchase of food, drugs, devices, services, or cosmetics (REG-060, REG-165), and it makes dissemination an unfair or deceptive act or practice within the meaning of section 45 of title 15 (REG-061). In plainer words, section 52 states the unlawful act, the means, the purpose, the products and the link to section 45 (REG-059, REG-164, REG-165, REG-060, REG-061). Compare each phrase in the table below with your own advertising copy and channels.

How does 15 U.S.C. 55(a)(1) phrase false advertisement?

Section 55(a)(1) describes an advertisement, other than labeling, that is misleading in a material respect (REG-062). The captured text reads "means an advertisement, other than labeling, which is misleading in a material respect" (REG-062). In plainer words, the text leaves labeling out of this description and covers an advertisement that is misleading in a material respect (REG-062). Compare your own advertising copy against this wording, separately from your labels.

Section 55(a)(1) also takes into account the extent to which an advertisement fails to reveal material facts (REG-063). The text continues by referring to "the extent to which the advertisement fails to reveal facts material in the light of such representations or material with respect to consequences which may result from the use of the commodity" (REG-063). In plainer words, the text refers to facts material in the light of the representations made and facts material with respect to consequences which may result from use (REG-063). This guide does not apply the text to any product. Compare what your own copy leaves out with this wording.

How does section 55 define a drug?

Clause (1) of the section 55 drug definition covers articles recognized in the official compendia it names (REG-168). Clause (1) reads "The term drug means (1) articles recognized in the official United States Pharmacopoeia, official Homoeopathic Pharmacopoeia of the United States, or official National Formulary, or any supplement to any of them;" (REG-168). In plainer words, an article recognized in one of those compendia meets clause (1) (REG-168). The section also states that the term "does not include devices or their components, parts, or accessories" (REG-169). In plainer words, the term excludes devices and their components, parts, or accessories (REG-169). Read the device definition alongside the drug text.

Does section 55 treat advertisements to the medical profession differently?

Section 55 says a drug advertisement shall not be deemed false if it is disseminated only to members of the medical profession and meets further conditions (REG-166). The statute states that no advertisement of a drug shall be deemed to be false if it is disseminated only to members of the medical profession, contains no false representation of a material fact, and includes, or is accompanied in each instance by truthful disclosure of, the formula showing quantitatively each ingredient of such drug (REG-166). In plainer words, the sentence requires dissemination only to members of the medical profession, no false representation of a material fact, and truthful disclosure of the formula showing quantitatively each ingredient (REG-166). The sources captured for this guide do not say how that sentence applies to any online store. Bring this sentence to a licensed attorney if it may bear on your situation.

Lookup table: section 55 phrases and their verbatim text

How does the 21 U.S.C. 321 drug definition compare?

Section 321 and section 55(c) both state "articles intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease in man or other animals" (REG-001, REG-064). Per 21 U.S.C. 321 and 15 U.S.C. 55, the passage "articles intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease in man or other animals" appears in both (REG-001, REG-064). In plainer words, the same wording appears in both titles (REG-001, REG-064). This guide draws no conclusion about any product from that overlap.

Section 321 states "articles (other than food) intended to affect the structure or any function of the body of man or other animals" (REG-001). Section 55(c) states "intended to affect the structure or any function of the body of man or other animals" (REG-065), and section 55(d)(3) repeats that wording for devices (REG-202). In plainer words, the three captured passages share the words "intended to affect the structure or any function of the body of man or other animals" (REG-001, REG-065, REG-202). The captured section 55(c) entry is a fragment of that definition, so this guide does not compare the rest of the two definitions. Read each definition in full in the comparison table.

Section 321(g)(1) covers "articles intended for use as a component of any article specified in clause (A), (B), or (C)" (REG-146). In plainer words, the clause reaches an article intended as a component of an article specified in clause (A), (B), or (C) (REG-146). The captured sources do not say whether the full statutes differ in other ways. Read the clause in full on the statute page.

Lookup table: 21 U.S.C. 321 passages used for comparison

How do the device, cosmetic and food definitions compare across the two titles?

The food definitions in the two titles read the same in the captured passages (REG-167, REG-150). Both passages say "(1) articles used for food or drink for man or other animals, (2) chewing gum, and (3) articles used for components of any such article" (REG-167, REG-150). In plainer words, both passages define food in the same words (REG-167, REG-150).

The cosmetic definitions differ in wording between the two titles (REG-152, REG-171). Section 321 says articles intended to be rubbed, poured, sprinkled, or sprayed, while section 55 says articles to be rubbed, poured, sprinkled, or sprayed (REG-152, REG-171). Unlike section 55, which has "intended for cleansing, beautifying" (REG-171), section 321 has plain "for cleansing, beautifying" (REG-152). Read each title's definition in its own words rather than assuming they match.

What does section 321 say about misleading labeling or advertising?

Section 321 says that deciding whether labeling or advertising is misleading takes into account, among other things, both its representations and the material facts it fails to reveal (REG-156). It states that if an article is alleged to be misbranded because the labeling or advertising is misleading, then in determining whether it is misleading there shall be taken into account (among other things) not only representations made or suggested by statement, word, design, device, or any combination thereof, but also the extent to which the labeling or advertising fails to reveal facts material in the light of such representations (REG-156). Like section 55(a)(1) (REG-063), section 321 refers to the extent to which the advertising fails to reveal facts material in the light of such representations (REG-156). This guide draws no conclusion about any product.

What does section 321 say about dietary supplements?

Section 321 defines the term "dietary supplement" as a product (other than tobacco) intended to supplement the diet that bears or contains one or more listed dietary ingredients (REG-161). The listed ingredients include a vitamin, a mineral, an herb or other botanical, and an amino acid (REG-161). In plainer words, the term covers a product intended to supplement the diet that contains listed dietary ingredients (REG-161). The sources captured for this guide do not classify peptides under this definition. Read the full definition before applying it to a product.

Section 321 says a dietary supplement shall be deemed to be a food within the meaning of the chapter, except for purposes of paragraph (g) and section 350f (REG-162). The exception is stated as "Except for purposes of paragraph (g) and section 350f of this title" (REG-162). In plainer words, a dietary supplement is treated as a food, with the exception stated (REG-162). Ask a licensed attorney which definition applies to your product.

What could not be read?

The FTC Health Products Compliance Guidance page could not be read on 2026-10-08 (REG-058). The captured sources do not say what that guidance page states. Look for the FTC's guidance through a source you can read directly.

FAQ

What does 15 U.S.C. 52 prohibit?

Section 52(a) makes it unlawful to disseminate, or cause to be disseminated, any false advertisement (REG-059). The statute states that it shall be unlawful for any person, partnership, or corporation to disseminate, or cause to be disseminated, any false advertisement (REG-059). In plainer words, the statute speaks of any person, partnership, or corporation (REG-059). The text goes on to cite dissemination by United States mails, or in or having an effect upon commerce, by any means, for the purpose of inducing (REG-164). Check where and how your own advertising is disseminated against this wording.

The statute names food, drugs, devices, services, or cosmetics in connection with advertisements likely to induce a purchase (REG-060). Section 52(a)(1) uses the phrase "which is likely to induce, directly or indirectly the purchase of food, drugs, devices, services, or cosmetics" (REG-060). In plainer words, the phrase covers advertisements likely to induce, directly or indirectly, the purchase of those items (REG-060). Subsection (a) states the purpose language again as "By any means, for the purpose of inducing, or which is likely to induce, directly or indirectly, the purchase in or having an effect upon commerce, of food, drugs, devices, services, or cosmetics." (REG-165) In plainer words, subsection (a) repeats the purpose language and adds the phrase in or having an effect upon commerce (REG-165). Compare the products you advertise with the categories the statute names.

Which products does section 52 mention?

Food, drugs, devices, services, or cosmetics (REG-060).

What is the "misleading in a material respect" text?

It is the captured text of 15 U.S.C. 55(a)(1): "means an advertisement, other than labeling, which is misleading in a material respect" (REG-062).

Does section 55 contain a drug definition?

Yes. The captured text includes clause (1) on articles recognized in the official United States Pharmacopoeia, official Homoeopathic Pharmacopoeia of the United States, or official National Formulary (REG-168).

Is a false advertisement an unfair or deceptive act?

Section 52(b) makes the dissemination of a false advertisement under subsection (a) an unfair or deceptive act or practice within the meaning of section 45 of title 15 (REG-061). The subsection states that dissemination of a false advertisement within the provisions of subsection (a) shall be an unfair or deceptive act or practice in or affecting commerce within the meaning of section 45 of title 15 (REG-061). In plainer words, a false advertisement within subsection (a) is classed as an unfair or deceptive act or practice (REG-061). The sources captured for this guide do not quote section 45 itself, so this guide says nothing about what follows from that cross reference. Read section 45 itself before relying on this cross reference.

What does the FTC guidance say about health products?

The guidance page could not be read on 2026-10-08, so this guide cannot say (REG-058).

Where is the 21 U.S.C. 321 drug definition?

Per 21 U.S.C. 321, the captured text begins with "articles intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease in man or other animals" (REG-001).

Is this legal advice?

No. Talk to a licensed attorney for your situation.

Sources

Talk to a licensed attorney for your situation.