L-tryptophan is metabolized to niacin (nicotinic acid).
molecular weight of L-tryptophan: 204.23
molecular weight of nicotinic acid (3-pyridinecarboxylic acid): 123.11
60 mg of tryptophan can roughly generate 1 mg of niacin
1 mg of tryptophan is 4.896 µmol
60 mg of tryptophan is 293.8 µmol
1 mg nicotinic acid is 8.12 µmol