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However, the ability to utilize tryptophan for NAD + synthesis is inefficient given that approximately 60 mg of tryptophan are required to synthesize 1 mg of NAD +

P.JiZ.ChangC

In the brain, supplemental tryptophan is turned into serotonin and melatonin, which aids sleep

Nature 521: 8589, 2015

PMC 5444519

In the world of biochemistry, this is the version that your cells can use immediately to perform critical tasks like neutralizing free radicals
