ERGOSTEROL
Safety score · 0–100
Good
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
A provitamin D2 sterol used in skincare for its photoprotective and barrier-supporting properties, convertible to ergocalciferol (vitamin D2) upon UV exposure.
Ergosterol is a plant and fungus-derived sterol that serves as a biological precursor to vitamin D2 (ergocalciferol). It is not restricted under EU cosmetic regulations and provides beneficial skin-conditioning effects. Its use in cosmetic formulations is considered safe, though environmental sourcing (from yeasts or fungi) may raise considerations for vegan labeling.
Skin benefits
- Provitamin D2 — supports vitamin D synthesis upon UV exposure
- Skin-conditioning emollient
- Barrier-supporting properties
References
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.