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In white adipose tissue of obese, insulin-resistant and aged mammals, NNMT is dramatically upregulated and because it consumes both the universal methyl donor (SAM) and the NAD precursor (nicotinamide), its hyperactivity simultaneously depletes the cellular methylation reserve and the NAD-salvage pool [1,2]

A Few Notes On Giving Yourself Vitamin B12 Shots Once your doctor prescribes B12, I recommend asking for insulin-size needles

Theres also interest in its anti-aging benefits, since boosting NAD+ and improving metabolism can have broad positive effects on health

Skipping steps almost always backfires

Then came the OPTIONS study