Science
Mechanism of Action
This ingredient acts as a reducing agent, utilizing its sulfhydryl (-SH) group to break disulfide bonds in hair keratin. In skincare, it provides humectant benefits and may reduce oxidative stress through redox reactions akin to N-acetylcysteine.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Indicated as an effective reducing agent for hair structure modification (waving or straightening) and as a skin-conditioning agent in external compositions.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Prone to oxidation due to its thiol (-SH) group, stability is improved by co-formulating with antioxidants like ascorbic acid and stabilizers such as sodium sulfite.
Synergies
- Ascorbic acid (antioxidant)
- Sodium sulfite (stabilizer)
Conflicts
- Strong oxidizing agents
- Metal ions (unless chelated)
- High alkaline environments (outside pH 5.0-8.0)
Safety
Safety Profile
Listed in the EU Cosmetic Ingredient Glossary (CosIng) for hair waving/straightening and skin conditioning, it currently has no specific Annex restrictions under EC Regulation 1223/2009.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Amidinocysteine is a valuable ingredient, offering proven skin conditioning and humectant properties, with potential for redox benefits, while also serving as a key agent in hair modification.
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References
Sources