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An oxidized derivative of the amino acid cysteine, sometimes used in hair care for its potential to strengthen hair or as a precursor in certain formulations.
Beneficial for
Safety summary
Generally considered safe.
CAS Number
498-40-8
1% line marker
This ingredient is commonly used as a marker to identify where ingredients drop below 1% concentration on the label.
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.