t-Butyl Benzoyl Peroxide

INCI: T-BUTYL BENZOYL PEROXIDE

CAS Number
614-45-9
Function
UV Absorber (per CosIng); organic peroxide with oxidizing properties
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status restricted
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes Benzoyl peroxide is an FDA-approved OTC active for acne; t-butyl benzoyl peroxide is not separately monographed โ€” would require separate evaluation

For full compliance data across 55 jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety (MoS)
not established
Dermal Absorption
moderate
Sensitization
moderate

Calculate MoS for your specific formulation with the MoS Calculator.

Expert Verdict

Organic peroxide โ€” explosive/flammable hazard in concentrated form; strong oxidizer; related benzoyl peroxide is Annex III restricted in EU cosmetics; use concentration limits strictly

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Concern Level: Moderate

Frequently Asked Questions

Is t-Butyl Benzoyl Peroxide safe in cosmetics?

Organic peroxide โ€” explosive/flammable hazard in concentrated form; strong oxidizer; related benzoyl peroxide is Annex III restricted in EU cosmetics; use concentration limits strictly The EU classifies t-Butyl Benzoyl Peroxide as "restricted". Safety rating: MODERATE.

Is t-Butyl Benzoyl Peroxide allowed in the EU?

t-Butyl Benzoyl Peroxide EU regulatory status: restricted. This is based on EU Regulation 1223/2009 and its amendments.

What does t-Butyl Benzoyl Peroxide do in cosmetics?

t-Butyl Benzoyl Peroxide functions as: UV Absorber (per CosIng); organic peroxide with oxidizing properties. It is classified as a cosmetic ingredient in our database. CAS number: 614-45-9.

What is the Margin of Safety for t-Butyl Benzoyl Peroxide?

not established The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.

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