are b12 injections or tablets better Vitamin vs. Supplements: Which Works Best? Getting The Best Out Of
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Gerontology Geriatrics Res

There are a few reasons why it might be a better idea to avoid OTC supplements

Kannt & Pfenninger, Frontiers in Physiology emphasize that NAD preservation enhances oxidative metabolism, supporting sustained exercise capacity

5-Amino-1MQ (5-amino-1-methylquinolinium) is the most studied inhibitor of nicotinamide N-methyltransferase (NNMT) an enzyme that acts as a metabolic brake in fat cells by depleting both SAM (S-adenosylmethionine) and NAD+ precursors
