I want to backtrack on whether the FDA ever restored l-tryptophan for human use. I started to buy it from animal supply houses and really did not pay that much attention to the issue.
Supposedly, tryptophan is what makes one sleepy after a big thanksgiving turkey dinner.
For further details, stop at a "dedicated" natural food store and ask. I relied on Wife1's knowledge of nutrition stuff without going into great detail --she is pretty sharp on that subject.
l- and d- (leuvo and dextro) chemicals are identical in conventional chemical formulas, but differ in the way the atoms are arranged structurally in the compound, and can form mirror images of each other when viewed structurally. The two versions can differ in their chemical reactions.
Corrections welcome.
Terry, 230RN