P.M. – your natural sleep aid
Tryptophan, an essential dietary amino acid, is used to produce serotonin, a neurotransmitter that helps to regulate sleep, and melatonin, the sleep hormone
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Tryptophan
Protein 101
The first amino acid to be discovered was asparagine, in 1806 and the last of the 20 to be found, threonine, was not identified until 1938