Butylated Hydroxy Toluene (BHT) is a synthetic antioxidant added to cosmetic formulations to prevent oxidation and rancidity of oils and fats, helping extend product shelf life. It functions as a stabilizing base ingredient rather than a skin-treatment active.
| Reported effect | How often | Notes |
|---|---|---|
Allergic contact dermatitis | Rare | Occasional reports of sensitization presenting as localized redness, itching, or eczema. |
Skin irritation | Uncommon | Mild irritation possible, generally at higher concentrations or on compromised skin. |
Contact urticaria | Very rare | Isolated case reports of hives following exposure. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.