Genistein is a soy-derived isoflavone with antioxidant and phytoestrogenic activity, studied topically for reducing UV-induced oxidative damage and supporting collagen in photoaged or estrogen-deficient skin. It acts by scavenging free radicals and modulating estrogen-receptor pathways in skin cells.
| Reported effect | How often | Notes |
|---|---|---|
| Mild skin irritation or redness | Uncommon | Transient erythema at application site, typically formulation-dependent. |
| Contact dermatitis | Rare | Allergic or irritant reactions reported in sensitive individuals. |
| Itching or stinging | Rare | Localized and usually self-limiting. |
| Theoretical hormonal/estrogenic effects | Very rare | Phytoestrogen activity raises theoretical concern with topical use, though systemic effects from skincare are minimal in studies. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.