T-Butyl Alcohol
Ingredient Info
T-Butyl Alcohol is a colorless liquid solvent used in cosmetics to help dissolve other ingredients, carry fragrance, and denature alcohol. It appears in small amounts in eye makeup, fragrances, and shaving products.
Benefits
- Helps dissolve and mix other skincare ingredients
- Carries fragrance effectively
- Allows for lightweight product formulations
Potential concerns
- Can cause moderate to severe eye irritation at high concentrations
- May cause mild to moderate skin irritation in sensitive individuals
- Emits volatile organic compounds (VOCs) that can affect indoor air quality
- Animal studies show potential kidney and liver effects at high exposure levels (not relevant at cosmetic-use concentrations)
Science: A 2005 safety assessment by the Cosmetic Ingredient Review panel concluded t-Butyl Alcohol is safe as used in cosmetics (typically 0.00001–0.3%), noting that concerning effects observed in animal studies occurred at doses far exceeding typical exposure. The ingredient is not mutagenic and poses minimal carcinogenic risk at cosmetic concentrations, though it can cause eye and skin irritation at high purity levels.
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