Soya (soybean-derived) ingredients are used in skincare as emollients, antioxidants and sources of isoflavones, fatty acids and proteins that may support skin barrier function and provide mild brightening or anti-aging effects. It appears in many formulations both as a functional active and as a base oil or extract.
| Reported effect | How often | Notes |
|---|---|---|
| Contact allergy / allergic contact dermatitis | Uncommon | Soy is a known allergen; sensitized individuals may develop redness, itching or rash. |
| Skin irritation or mild stinging | Uncommon | More likely in those with sensitive or compromised skin barriers. |
| Contact urticaria | Rare | Immediate hive-like reaction reported in soy-allergic individuals. |
| Systemic allergic reaction | Very rare | Extremely uncommon from topical use; greater concern with ingestion in soy-allergic individuals. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.