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Notably, within the first two hours after infusion, no discernible increases in plasma or urine levels of NAD+ or its metabolites were seen, indicating quick and thorough tissue absorption and/or metabolism (at least for the first 2 hours) (1)

If your levels are already adequate, extra B12 won't noticeably change how you feel it just keeps you topped off

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Additionally, scientists examine its influence on adipose tissue metabolism and fat oxidation pathways