BHT
Ingredient Info
BHT (butylated hydroxytoluene) is a synthetic antioxidant used in skincare products to prevent oils and other ingredients from oxidizing and going rancid. It's used at very low concentrations (0.0002% to 0.5%) to extend shelf life.
Benefits
- Prevents product degradation and extends shelf life
- Keeps formulations stable over time
- Allows use of beneficial oils without them spoiling
Potential concerns
- Can cause skin irritation or allergic reactions in sensitive individuals at higher concentrations
- May cause mild contact sensitization in some people
- Minimal systemic absorption when applied to skin, but oral ingestion studies show potential liver and kidney effects at high doses
Science: The Cosmetic Ingredient Review Expert Panel concluded BHT is safe as used in cosmetic formulations at typical concentrations. When applied to skin, BHT remains largely in the skin with minimal systemic absorption, unlike oral exposure which showed some toxic effects in animal studies at high doses.
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