Where Cosmeceuticals and Functional Foods Fall Under Thai FDA Rules

"Cosmeceutical," the informal term many markets use for a cosmetic product marketed with active ingredients claimed to have biological effects on the skin, does not exist as a category under Thai law. Thailand draws the line differently, and more strictly, than brands accustomed to Western markets often expect: whether a beauty-positioned product is regulated as a supplement or a cosmetic comes down to how it's taken, not what benefit it promises.

Why there's no cosmeceutical category to register under

Thailand's Cosmetics Act B.E. 2558 (2015) defines a cosmetic as a substance applied to the body for cleansing, beautifying, or altering appearance, without affecting body structure or function. Anything that does claim to affect body structure or function is a drug, not a cosmetic, and Thai FDA applies that test with real teeth. A topical product claiming to "stimulate collagen production" or "reduce hyperpigmentation by 50 percent" is likely to be judged as having crossed from cosmetic into drug territory and to require drug registration, a stricter reading than many Western regulators apply to comparable claims.

Oral products, beauty supplements sometimes marketed as "inner beauty" products, fall under food supplement regulation instead of cosmetic rules, registered and controlled under the Food Act like any other supplement. The fact that the intended benefit is cosmetic, better skin, fewer wrinkles, thicker hair, doesn't change which framework applies. Route of administration decides the framework, not the marketed benefit.

Registering a beauty supplement under the food framework

Beauty supplements are among the fastest-growing categories in the Thai market, driven by consumer appetite for ingestible products positioned around skin whitening, anti-aging, and hair or nail health. Collagen peptides (marine or bovine), astaxanthin, glutathione, coenzyme Q10, biotin, and plant-derived antioxidants like grape seed extract and other polyphenols are the common building blocks, and all of them register as food supplements under the Notification on Food Supplements (No. 293). Every ingredient in the formula needs to be either an established food substance with a Thai history of safe use, an approved nutrient under the supplement notification, or an ingredient that has already cleared novel food assessment.

Several popular beauty ingredients sit right at that novel food line. Collagen peptides, marine and bovine, generally clear without novel food review for standard preparations, given their growing history of use in Thai food and supplements, but novel forms, novel sources such as insect-derived collagen, or unusually high-dose preparations may still need safety review, and the source species and production process have to be fully disclosed regardless. Oral glutathione for skin whitening is a massive commercial category in Thailand, and Thai FDA has at points required safety data for the doses typically used in beauty supplements, which run higher than what's found in standard food sources; confirming the agency's current position on acceptable glutathione dosing before finalizing a product spec is worth the extra step. Astaxanthin from Haematococcus pluvialis algae has already been assessed and accepted for supplement use following a novel food review, but the dose and form used in a given product still have to match what Thai FDA has actually accepted, with the dossier referencing that Thai FDA assessment or an equivalent EFSA or GRAS determination Thai FDA recognizes.

The claims that clear, and the ones that don't

Beauty supplement advertising in Thailand has to satisfy two sets of rules at once, the food advertising rules barring disease claims and misleading claims, and the cosmetic advertising rules that trigger drug classification for any claim implying a change to body structure or function. This is one of Thai FDA's more actively enforced areas of food advertising surveillance, and the pattern of what gets refused is consistent: "whitens skin in X days," "reduces wrinkle depth by a specific percentage," "clinically proven to reverse aging," "stimulates collagen production," "equivalent to topical retinol," and "replaces anti-aging skincare" are all claims that draw enforcement attention or outright refusal.

What survives review looks noticeably more modest: "contributes to normal collagen formation," which can lean on established nutrient function evidence for vitamin C, "provides antioxidant support," and "supports skin health" framed around a general antioxidant mechanism rather than a specific structural claim. The practical upshot is that beauty supplement brands operating in Thailand work within a narrower claims envelope than they may be used to elsewhere, and the ones that succeed here have generally shifted their messaging toward ingredient story, high-quality marine collagen, potent astaxanthin, a standardized polyphenol extract, and lifestyle positioning, rather than leaning on the specific efficacy claims that trigger compliance problems.

Functional foods: no separate category here either

Thailand has no standalone "functional food" regulatory category distinct from general food rules. A product carrying added nutrients or functional ingredients, a fortified beverage, a protein bar with a health benefit claim, a fermented drink carrying a probiotic claim, is regulated as an ordinary food product under whichever specific food standard applies, or the general food standard if none does, with the added ingredients treated as food additives or as nutrients subject to their applicable limits.

Classification follows the product's primary form, not its functional positioning. A probiotic-enhanced yogurt is a dairy product. A collagen-fortified ready-to-drink beverage is a beverage. The food additive rules govern whatever functional ingredients go into these products, and any health or function claim in the advertising has to satisfy the same food advertising regulations that apply to a standalone supplement. This creates a real practical wrinkle for brands operating across both spaces: the same ingredient, collagen, probiotics, plant extracts, can end up registered under entirely different frameworks depending purely on the product's format. Collagen in a capsule is a food supplement. Collagen added to a ready-to-drink beverage is a fortified beverage under the general food framework, with the collagen itself treated as a food additive or added nutrient. The two products need separate registrations and are held to different label format requirements even though the active ingredient is identical.

Designing the claims strategy before the label is set

Brands that understand Thai FDA's claims boundary early, before finalizing global marketing language for the Thai market, avoid the costly revision work that comes from discovering mid-launch that international claims don't survive Thai review. DeeMED Consulting advises beauty supplement and functional food brands on classification and claims strategy for exactly this reason, and for brands whose products span both supplement and cosmetic applications, a collagen powder sold both as a beverage ingredient and a topical mask ingredient, for example, we work through how to structure the product lineup so each application keeps clean, separate classification. Our health claims and labeling review is where this classification and claims work gets done before a campaign, or a label, goes live.

Influencer marketing adds its own layer of exposure

Beauty supplement brands in Thailand lean heavily on influencer and social media marketing, and this channel creates a compliance risk that sits outside the product's own registered label and approved advertising materials. An influencer describing a collagen supplement in their own words, on their own account, without reviewing the approved claims language first, can easily reach for exactly the kind of structural or disease-adjacent claim, "erases wrinkles," "cures acne from the inside," that would never clear Thai FDA's advertising pre-approval if the brand had submitted it directly. Thai FDA's enforcement against non-compliant digital advertising has not limited itself to brand-owned channels; influencer content promoting a specific product has been treated as advertising subject to the same rules, with the registration holder bearing responsibility for what gets said about their product even when a third party said it.

Brands running influencer campaigns for beauty supplements in Thailand benefit from providing creators with a pre-approved set of claims language and a clear list of terms to avoid, rather than leaving product description entirely to the creator's own interpretation of the product's benefits. This is a lighter lift than it sounds, since the same claims boundary work done for a brand's own advertising materials, the difference between "supports skin health" and "reverses aging," for instance, can be repackaged as simple guidance for creator partners before a campaign launches, closing off a source of enforcement exposure that brands otherwise discover only after a campaign is already live and drawing regulatory attention.