Can a peptide serum claim to boost collagen?

Only with careful wording. Under US law the claim decides the category: a serum said to make lines less noticeable by moisturizing is a cosmetic, while one said to remove wrinkles or increase the skin’s production of collagen is, in FDA’s words, a drug or a medical device, and drugs need FDA approval before sale.

The short answer

A cosmetic can be sold on appearance; it cannot, without becoming a drug, be sold on changing how the skin works. FDA says products intended to affect the structure or function of the body, such as the skin, are drugs, or sometimes medical devices, even if they affect the appearance, and gives as examples a product intended to remove wrinkles or to increase the skin’s production of collagen.¹ Drugs must have FDA approval for safety and effectiveness before they go on the market; cosmetics do not (see Are peptide skincare products FDA-approved?).¹

Wording on each side of the line

These are FDA’s own illustrations, not a complete list. FDA describes cosmetic claims in general as ones about cleansing, beautifying, promoting attractiveness or altering the appearance.²

How FDA decides: intended use

FDA says a product’s category is determined by its intended use, and gives three ways intended use can be established: claims on the labeling, in advertising, on the internet or in other promotional material; consumer perception, meaning why the consumer is buying it and what they expect it to do; and ingredients that have a well-known therapeutic use.² The first matters most here: a claim made on a website or in an ad counts, not only the words on the bottle.

“Cosmeceutical” is a marketing word

You will often see peptide serums described as “cosmeceutical.” FDA states that the term has no meaning under the law: the Federal Food, Drug, and Cosmetic Act does not recognize it, and the cosmetic industry uses it for cosmetic products said to have medicinal or drug-like benefits.³ A product can be a drug, a cosmetic, or both, but not a “cosmeceutical.”² So the word tells you how a product is being positioned, not which legal category it is in, and it carries no FDA approval.

What the rule does and does not tell you

• It does not tell you whether a claim is true. FDA does not have a list of approved or accepted claims for cosmetics and has no authority to approve claims before cosmetics go on the market.⁴ Cosmetic labeling claims must be truthful and not misleading; FDA regulates labeling claims and the Federal Trade Commission regulates advertising claims.⁴
• It does not prove that wording makes a product unlawful. Intended use looks at claims, perception and ingredients together.² We do not label any product from a phrase on its page, and this page names none.
• FDA does act on drug claims in cosmetics. FDA says it monitors cosmetics on the market and has issued warning letters to cosmetic firms that made unapproved drug claims.⁴
• It is separate from what research shows. When a Library page reports that an ingredient changed collagen in cells or in a trial, that is research on the ingredient, graded on its own terms, not a claim about any product. See Do copper peptides actually work? and What does a peptide serum actually do?

Reading a product page

1. Find the verbs. Words about appearance (smooths, moisturizes, hides, looks) tend to sit on FDA’s cosmetic side; words about changing what the skin does (increases collagen production, removes wrinkles, regenerates) tend to sit on the drug side. FDA decides intended use from the claims, how consumers see the product and its ingredients together.
2. Check every place the product is described: label, website, ads and social posts all count toward intended use.²
3. Read the ingredient list, which FDA requires on cosmetics sold at retail.⁵ Then look up the ingredient: copper peptides, Matrixyl 3000 and Argireline each have their own evidence page.
4. Treat “cosmeceutical” as a description of marketing, and treat a claim to change skin structure as a reason to ask how the product is being sold, not as proof of anything.

As of this review, and what would change it

We will revise and date this page if FDA revises any of them, if FDA or the courts change how intended use is applied to cosmetic claims, or if a reader shows us an error (use the “Report an error” topic on About). For whether a product passed our own checks, see Check a product and How we check.