Genistein is a soy-derived isoflavone used topically for its antioxidant and estrogen-like activity, with research suggesting benefits for photoaging, collagen support, and skin elasticity. It is considered a treatment active in anti-aging formulations.
| Reported effect | How often | Notes |
|---|---|---|
| Mild skin irritation or erythema | Uncommon | Transient redness reported in some topical studies, generally mild. |
| Contact dermatitis / allergic reaction | Rare | Possible in individuals with soy sensitivity or isoflavone allergy. |
| Itching or stinging on application | Uncommon | Localized and typically resolves after discontinuation. |
| Theoretical hormonal/estrogenic effects | Very rare | Phytoestrogen activity raises theoretical concern, but systemic effects from topical use are not well documented. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.