Butylated Hydroxy Anisole (BHA) is a synthetic phenolic antioxidant added to cosmetics and personal care products to prevent oxidative degradation of fats, oils, and other susceptible ingredients, thereby extending shelf life. It functions as a stabilizing formulation aid rather than a skin-treating active.
| Reported effect | How often | Notes |
|---|---|---|
| Allergic contact dermatitis | Uncommon | Reported as a contact allergen in sensitized individuals, sometimes with cross-reactivity to BHT. |
| Skin irritation | Rare | Mild redness or irritation occasionally noted, generally at higher concentrations. |
| Contact urticaria | Very rare | Isolated case reports of hives upon contact. |
| Depigmentation/leukoderma | Very rare | Rare reports of pigment loss associated with phenolic antioxidant exposure. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.