BHT (butylated hydroxytoluene) is a synthetic phenolic antioxidant used in small amounts to prevent oxidation and rancidity of oils, fragrances, and other unstable components, helping maintain product stability and shelf life.
| Reported effect | How often | Notes |
|---|---|---|
| Mild skin irritation | Uncommon | Occasional redness or stinging, typically at higher concentrations. |
| Allergic contact dermatitis | Rare | Documented but infrequent sensitization in patch-test studies. |
| Contact urticaria | Very rare | Isolated case reports of hive-like reactions. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.