Investigational chemical
GUANYLCYSTAMINE HBR
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
A guanidine-thiol compound studied as a radioprotectant rather than as a cosmetic. It has no established cosmetic use, no major safety reviews, and is not a recognized skincare active.
Skin benefits
- Sulfur-containing compound historically explored as a radioprotectant
- Has been investigated in research settings
Known concerns
- Not an established cosmetic ingredient with CIR or SCCS approval
- Limited cosmetic-grade safety data
- Thiol/guanidine compounds can be irritating and reactive
- Pharmacological background raises regulatory questions
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.