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Description
The cancelled 2015 Phase I trial (NCT02637284) was almost certainly abandoned for this reason rather than buried by a regulator

It is the primary substrate for the body's antioxidant defense network directly quenching reactive oxygen species that damage DNA, proteins, and cellular membranes

NAD+ is a large, charged molecule, and the gut isnt kind to it

Here is the athlete-specific breakdown

Protein-rich foods also stimulate gastric acid secretion and slow pyloric opening
