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doi: 10.1111/jocd.12894

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 +

Update on melatonin receptors: IUPHAR review 20

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Oxidative stress happens when there is an imbalance between free radicals (unstable molecules that can damage cells) and antioxidants in your body