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Vitamin U is a term introduced in the early 1950s to identify a compound in cabbage juice. Examples of methionine derivatives often called vitamin U include S-methylmethionine (SMM), methylmethionine sulfonium (SMM), and 3-amino-3-carboxypropyl dimethylsulfonium. Vitamin U is available not only as a kind of bulk raw materials for dietary supplements but also found naturally in various foods, particularly cruciferous vegetables like cabbage, broccoli, Brussel sprouts, and kale.