Phenylthioglycolic Acid

INCI: PHENYLTHIOGLYCOLIC ACID

CAS Number
103-04-8 [^1_1]
Function
Depilatory agent / hair-waving agent
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status restricted
EU Max Conc. 5%
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes FDA permitted cosmetic ingredient; no specific monograph; manufacturer responsibility under FD&C Act

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

Safety Data

Margin of Safety (MoS)
adequate
Dermal Absorption
moderate
Sensitization
moderate

Calculate MoS for your specific formulation with the MoS Calculator.

Expert Verdict

Strong skin and eye irritant; must not contact eyes; eyelash use restricted to professional application only at concentrations up to 11%; not suitable for daily use or application to large body surfaces.

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Concern Level: Moderate

Frequently Asked Questions

Is Phenylthioglycolic Acid safe in cosmetics?

Strong skin and eye irritant; must not contact eyes; eyelash use restricted to professional application only at concentrations up to 11%; not suitable for daily use or application to large body surfaces. The EU classifies Phenylthioglycolic Acid as "restricted". Safety rating: MODERATE.

Is Phenylthioglycolic Acid allowed in the EU?

Phenylthioglycolic Acid EU regulatory status: restricted. Maximum allowed concentration: 5%. This is based on EU Regulation 1223/2009 and its amendments.

What does Phenylthioglycolic Acid do in cosmetics?

Phenylthioglycolic Acid functions as: Depilatory agent / hair-waving agent. It is classified as a cosmetic ingredient in our database. CAS number: 103-04-8 [^1_1].

What is the Margin of Safety for Phenylthioglycolic Acid?

adequate 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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