Is Sulfonium, [(3S)-3-amino-3-carboxypropyl]dimethyl-, inner salt vegan?

Methylmethionine is also known as Sulfonium, [(3S)-3-amino-3-carboxypropyl]dimethyl-, inner salt.

S-Methylmethionine is a naturally occurring sulfonium derivative of methionine, biosynthesized from L-methionine and S-adenosylmethionine, particularly abundant in plants; used as a cosmetic ingredient.

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