Researched by Helena DeMaria-Williams
Formula IngredientAntioxidantBHT
INCI: BHT
BHT (butylated hydroxytoluene) is a synthetic antioxidant widely used as a preservative in both food and cosmetic products since the 1970s. It works by neutralising free radicals that cause oxidative degradation, thereby extending the shelf life and efficacy of cosmetic formulations. The CIR (Cosmetic Ingredient Review) has assessed BHT as safe for cosmetic use at typical concentrations.
Category
Antioxidant
Irritation Risk
Low
Skin Types
all skin types
What does this do in a formula?
antioxidant protection, product stabilisation, extends shelf life, preservative
Is BHT safe? Key considerations
Can BHT cause irritation?
Low RiskBHT is generally non-irritating at typical cosmetic concentrations of 0.01–0.1%. Some individuals with very sensitive skin or known BHT allergy may experience contact dermatitis, though this is rare. No EU CosIng Annex II or III restrictions apply for cosmetic use.
Does BHT increase sun sensitivity?
No RiskBHT does not increase photosensitivity. No sun protection precautions are required beyond normal recommendations.
Is BHT safe during pregnancy?
CautionBHT is generally considered low risk at the very small concentrations used in cosmetics (0.01–0.1%), as topical absorption is minimal. However, some precautionary sources recommend limiting exposure to synthetic antioxidants during pregnancy. Consult a healthcare provider if concerned.
How does BHT work?
BHT (butylated hydroxytoluene) is a synthetic antioxidant widely used as a preservative in both food and cosmetic products since the 1970s. It works by neutralising free radicals that cause oxidative degradation, thereby extending the shelf life and efficacy of cosmetic formulations. The CIR (Cosmetic Ingredient Review) has assessed BHT as safe for cosmetic use at typical concentrations.
Individuals with known BHT allergy, contact dermatitis to BHT should review the considerations above before use.
