Bht
Ingredient Info
BHT (butylated hydroxytoluene) is a synthetic antioxidant used in skincare products to prevent oils and other ingredients from oxidizing and breaking down. It helps extend the shelf life of formulations by protecting them from degradation caused by air exposure.
Benefits
- Preserves product freshness and stability
- Prevents rancidity in oil-based formulations
- Extends product shelf life
Potential concerns
- May cause mild skin irritation or sensitization in sensitive individuals
- Can trigger allergic reactions in some people (positive patch test results reported in small percentage of patients)
- Used at very low concentrations in cosmetics, but some consumers prefer to avoid synthetic preservatives
Science: The Cosmetic Ingredient Review Expert Panel concluded BHT is safe as used in cosmetic formulations (typically 0.0002–0.5%). While animal studies at high oral doses showed liver and kidney effects, topical application at cosmetic concentrations showed no significant irritation or systemic absorption concerns. Clinical testing found no depigmentation or photosensitivity issues.
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