A thiol compound for waving and hair removal. It softens keratin in professional products. Use per directions.
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
A functional thiol compound. Safe at correct dosing.
Thiolactic Acid (INCI Thiolactic Acid) is a sulphur-containing compound with a reactive thiol group. It is used in professional hair chemistry: the ingredient breaks the disulphide bonds of keratin, which is how perming and hair-removal products do their work. In essence this is a functional reagent, not a skincare active. Its effect is real and chemically proven: keratin genuinely softens. But this is a controlled technical process, not nourishment or repair. Products with it are used strictly as directed and usually only briefly. During pregnancy and breastfeeding the topical use of a finished product is systemically negligible, so it can be used. Avoiding prolonged contact and the sharp odour is sensible, but there is no direct restriction. Tolerance in a correctly pH-balanced formula is reasonable, since the manufacturer balances the recipe. The irritation potential and allergy risk are rated low, although sulphur compounds can have an off-putting smell. For sensitive skin it is better to test the reaction in advance and not leave the product on too long.
Irritation potential
LowAllergen risk
LowPregnancy
SafeSuitable for
The Evigrade extension adds an evidence panel to iHerb, Sephora, Druni and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Thiolactic Acid is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Thiolactic Acid suits: normal, dry, combination, oily, sensitive.
A thiol compound for waving and hair removal.
The INCI name is Thiolactic Acid. It may also appear as: Тиомолочная кислота.
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