l-tryptophan

詳細解釋：

L-tryp.to.phan

n.（名詞）
The biologically active form of the amino acid tryptophan, which is capable of being incorporated into proteins, such as the neurotransmitter serotonin. It has not been available as a dietary supplement in the United States since 989 but is sold commercially outside of the United States.
L-色胺酸：能與蛋白質合成的色胺基酸生物活化形式，如神經傳遞素5-羥色胺。直到9 * 美國才將其列入輔助食品，但也只在美國以外地區販賣