Strong base that works as a pH regulator at minimal concentrations in cosmetic formulas. After neutralizing acids, only potassium salts remain in the finished product.
Topical application
CWeak evidence. In vitro data, open-label studies, or expert consensus.
Technological pH regulator. At a concentration around 0.1–1% it does not irritate the skin because in a finished emulsion it turns into a neutral salt.
Potassium Hydroxide (KOH, caustic potash) is a strong inorganic base. In pure form an aggressive alkali; in cosmetic formulas it is used in micro-concentrations as a pH regulator. Where applied. Vitamin C and acid serums, cleansing gels, soaps (fat saponification), peels (0.01-1%). After acid neutralisation in the finished product only potassium salts remain – no caustic base. Safety. CIR confirmed safety at cosmetic concentrations. EU Annex III limits potassium hydroxide in hair and cuticle products (≤4.5% in solid soap, ≤2% in hair products). In finished products residual KOH is micro-quantities, neutral pH. Pregnancy and lactation – safe.
Irritation potential
LowAllergen risk
LowPregnancy
SafeSuitable for
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Potassium Hydroxide is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Potassium Hydroxide suits: oily, dry, combination, normal.
Strong base that works as a pH regulator at minimal concentrations in cosmetic formulas.
The INCI name is Potassium Hydroxide. It may also appear as: Гидроксид калия.
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