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BETA-SITOSTERYL ACETATE

CAS 915-05-9
88

Safety score · 0–100

Good

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

About

A plant-derived sterol acetate that reinforces the skin's barrier, helping to lock in moisture and protect against environmental stressors.

Beta-Sitosteryl Acetate is the acetate ester of beta-sitosterol, a phytosterol abundant in plant cell membranes. It is produced by acetylating the hydroxyl group of beta-sitosterol. In cosmetics, it acts as an emulsifying agent and occlusive skin conditioner, helping to reduce transepidermal water loss (TEWL) and improve skin barrier integrity. Plant sterols and their esters are widely regarded as safe for topical use.

Skin benefits

  • Barrier reinforcement
  • Moisture locking
  • Skin conditioning
  • Emollient properties

Known concerns

  • Generally recognized as safe for topical use
  • Rare contact allergy possible in sensitive individuals

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 — always read the physical product label and consult a healthcare professional for personal concerns.