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NAD+ is a naturally occurring coenzyme, not a peptide and not an approved injectable medicine for these uses

J Cell Mol Med (2013) 17(1):3054

Russ Webb 2002 Bradford Pear 20

Also it's worth noting that if you have blood work conducted and it returns as falling within "the normal range" then know that "normal" does not equal optimal and therefore, if you do suffer any of the symptoms noted above with "normal levels" then you may well benefit from the extra boost

Determination of oxidative stress levels and some antioxidant enzyme activities in prostate cancer

No changes occurred with an isocaloric-isonitrogenous diet, which suggests that GlyNAC is specifically necessary for benefits, and that generalized protein supplementation does not improve these defects