Cysteamine Thioglycolate

INCI: CYSTEAMINE THIOGLYCOLATE

CAS Number
24901‑29‑9 (reported for cysteamine thioglycolate in cosmetic databases)
Function
Hair waving/straightening agent, reducing agent in permanent waving/relaxing products
Safety Rating
MODERATE

Regulatory Status

🇪🇺 EU Status restricted
🇺🇸 US Status permitted
US Notes No specific FDA prohibition; used as a waving/straightening agent under general safety requirement; must be formulated to avoid excessive irritation and comply with labeling (e.g. avoid contact with eyes/skin, professional-use instructions)

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 odor with eye and skin irritation risk; must not be used on damaged or irritated scalp; strict compliance with Annex III concentration limits, pH, contact time, and warning statements required.

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Concern Level: Moderate

Frequently Asked Questions

Is Cysteamine Thioglycolate safe in cosmetics?

Strong odor with eye and skin irritation risk; must not be used on damaged or irritated scalp; strict compliance with Annex III concentration limits, pH, contact time, and warning statements required. The EU classifies Cysteamine Thioglycolate as "restricted". Safety rating: MODERATE.

Is Cysteamine Thioglycolate allowed in the EU?

Cysteamine Thioglycolate EU regulatory status: restricted. This is based on EU Regulation 1223/2009 and its amendments.

What does Cysteamine Thioglycolate do in cosmetics?

Cysteamine Thioglycolate functions as: Hair waving/straightening agent, reducing agent in permanent waving/relaxing products. It is classified as a cosmetic ingredient in our database. CAS number: 24901‑29‑9 (reported for cysteamine thioglycolate in cosmetic databases).

What is the Margin of Safety for Cysteamine Thioglycolate?

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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