Drug or cosmetic: which claims are regulated

Read enough skincare packaging and you notice a pattern in the phrasing. Nothing treats. Nothing cures. Products reduce the appearance of things. Serums support, promote, help, and are inspired by.

That is not weak copywriting. It is careful compliance with a statutory line, and once you can see the line the whole category reads differently.

The definitions

A cosmetic is defined as “articles intended to be rubbed, poured, sprinkled, or sprayed on, introduced into, or otherwise applied to the human body or any part thereof for cleansing, beautifying, promoting attractiveness, or altering the appearance”, excluding soap.

A drug includes “articles intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease in man or other animals”, and separately “articles (other than food) intended to affect the structure or any function of the body of man or other animals”.

Read those next to each other and the difference is not chemistry. It is purpose.

The word doing all the work is intended

Both definitions turn on what a product is intended for, and intent is established largely by what the maker claims.

The consequence is genuinely strange and it is worth stating in full: the same formula can be a cosmetic or a drug depending on the words on the box. Nothing inside has to change.

A moisturiser that says it softens skin is a cosmetic, because softening is altering the appearance. The identical product saying it treats eczema is a drug, because eczema is a disease and treatment is a drug claim. A cream that says it firms is fine; the same cream saying it stimulates collagen synthesis has claimed to affect the structure of the body, which is the second half of the drug definition.

This is why reduces the appearance of fine lines is such a universal formulation. Appearance is squarely inside the cosmetic definition. Reducing fine lines is not.

What being a drug actually costs, and buys

Once a product is a drug it needs approval, either through a new drug application or by conforming to a monograph, and the monographs are why an ordinary shop can sell drugs at all.

A monograph is a rule book for a category. The dandruff monograph names its permitted actives with ranges: coal tar at 0.5 to 5 percent, Pyrithione zinc at 0.3 to 2 percent when washed off after brief exposure. Stay inside the rule book and you may market without individual approval.

What that buys the reader is information. A drug carries a drug facts panel naming the active and its strength. That is why a sunscreen tells you it contains 10 percent Zinc oxide and the serum next to it tells you nothing about its concentrations.

The categories that are drugs in the US are worth memorising because they are counterintuitive: sunscreens, anti-dandruff shampoos, acne treatments containing Salicylic acid or Benzoyl peroxide at monograph strengths, antiperspirants, fluoride toothpaste, and skin protectants.

The gap where nothing is checked

The line has a consequence people rarely notice. Cosmetic claims are not pre-cleared by anyone.

A cosmetic does not need approval before sale. Nobody reviews the claim before it appears. Enforcement is after the fact and rare. So the category with the least oversight is also the one making the most confident promises, and it can do that precisely because it stays inside words like appearance and radiance.

Where FDA has taken a view on a cosmetic-adjacent claim, it is worth knowing. For over-the-counter topical hair growth products the regulation states that “all labeling claims for OTC hair grower and hair loss prevention drug products for external use are either false, misleading, or unsupported by scientific data”. That is unusual bluntness and it is set out on the hair loss page.

The retinol case

Retinol is the clearest illustration of the line running through one molecular family.

Prescription tretinoin is a drug with an approved indication, studied outcomes and a known side effect profile. Over-the-counter retinol is a cosmetic. Chemically they are relatives and retinol converts to the active form in skin, less efficiently and at a concentration the label does not state.

Same family, two regulatory worlds, and the difference in what you are told is total: a stated strength and a warning leaflet on one side, and an ingredient position on a list on the other.

How to use this when shopping

Look for a drug facts panel. It takes a second and it tells you which world you are in. If there is one, read the active and its strength. If there is not, no concentration is disclosed and no claim was reviewed.

Read the verbs. Treat, cure, prevent and restore are drug words and you will rarely see them on a cosmetic. Appearance, look, feel and help are the cosmetic vocabulary, and their presence tells you what the company’s lawyers concluded.

Do not read absence as weakness. Plenty of cosmetics do useful things honestly. Conditioning agents condition, humectants hydrate, and a product that only claims what it can support is behaving well.

The mechanics of the ingredient list itself are in the guide to reading a cosmetics label.