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Ergothioneine (CAS: 497-30-3) is a rare, naturally occurring sulfur-containing histidine derivative, first isolated from the ergot fungus (Claviceps purpurea) and now found abundantly in mushrooms (e.g., porcini), animal liver, and human erythrocytes. Its unique ​mercaptoimidazolone structure​ confers exceptional redox capabilities, making it a potent antioxidant. In 2022, the FDA classified it as GRAS (Generally Recognized as Safe), while the EU EFSA approved it as a novel food ingredient (2021/C 456/03).

Product Name: Ergothioneine

IUPAC Name: (2S)-3-(2-Thioxoimidazolidin-4-yl)-2-(trimethylammonio)propanoate

CAS No.​: 497-30-3

Molecular Formula: C₉H₁₅N₃O₂S

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