Cholecalciferol (vitamin D3) is a fat-soluble vitamin used in skincare for its role in epidermal differentiation, barrier function, and potential antioxidant support. It is synthesized in skin upon UVB exposure and may be added topically to support skin health.
| Reported effect | How often | Notes |
|---|---|---|
Mild local irritation or redness | Uncommon | Transient erythema or stinging at application site, generally with higher concentrations. |
Contact dermatitis | Rare | Allergic or irritant reactions reported in sensitive individuals. |
Hypercalcemia from systemic absorption | Very rare | Theoretical risk with extensive use over large areas or compromised skin; mainly a concern with oral overdose, not typical topical use. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.