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Sulphur amino acid derivative

METHYLMETHIONINE

CAS 4727-40-6
70

Safety score · 0–100

Fine

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

Methylmethionine, also called vitamin U, is a sulphur amino acid better known for digestive support. In cosmetics it is used for mild conditioning, with reasonable safety but modest dermal evidence.

Skin benefits

  • Methylated form of the essential amino acid methionine
  • Studied as a stomach mucosa protector (vitamin U) in food and supplements
  • May offer mild antioxidant or conditioning effects in skin

Known concerns

  • Limited cosmetic-specific safety data versus oral data
  • Sulphur compounds can carry odour or stability issues
  • Effects on skin not well documented at typical use levels

References

EU

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.