That's the point. I didn't have the energy to exercise until I started taking Niagen. And, upping my dose to the current 500mg seems to have given me yet another boost.
In Reply to 'diddobuyer' It could just be your body is getting into shape and have nothing to do with the supplement. I am in shape I started taking this and have not noticed anything.
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Be kinder than necessary, for everyone you meet is fighting some kind of battle.