"Vitamin U" was the name given in 1952 to a substance found in cabbage juice by Dr. Garnett Cheney. Drinking about a quart of cabbage juice per day is an excellent remedy for peptic ulcers, but the identity of the active ingredient remains unknown. A common guess is that it is allantoin, which is also found in comfrey root, and has long been used in folk medicine both externally and internally. Other guesses are that it is a relative to the amino acid L-methionine. Vita...
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