Is Ammonium, [1-carboxy-2-(2-mercaptoimidazol-4-yl)ethyl]trimethyl-, hydroxide, inner salt, L-(+)- vegan?

Ergothioneine is also known as Ammonium, [1-carboxy-2-(2-mercaptoimidazol-4-yl)ethyl]trimethyl-, hydroxide, inner salt, L-(+)-.

Ergothioneine is a naturally occurring sulfur-containing amino acid derivative of histidine, found in fungi (notably mushrooms), certain bacteria, and some plants; it can also be produced synthetically or via fermentation for cosmetic use.

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