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Humectant

3-HYDROXYBUTYRIC ACID

CAS 625-72-9
60

Safety score · 0–100

Fine

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

A small hydroxy acid-related molecule that can help with hydration, but it is not especially gentle in concentrated form.

3-Hydroxybutyric acid is a short-chain hydroxy acid derivative used in some newer cosmetic concepts. Hazard data show irritation potential for skin, eyes, and airways in raw form, so it is not in the ultra-safe humectant class. At low topical use levels it may still be workable, but it deserves more caution than glycerin-style hydrators.

Function

ANTI-SEBUMHUMECTANTPLASTICISER

Skin benefits

  • May support hydration at low use levels
  • May help with skin feel and buffering

Known concerns

  • Skin irritation in concentrated form
  • Eye irritation
  • Can sting compromised skin

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.