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Side effects are rare and mild but may include slight tenderness, redness, or bruising at the injection site, which typically fades within a few hours

If you drink alcohol, you will be using more vitamin B12 than those who abstain

In diet-induced obesity (DIO) models, NNMT loss-of-function and selective small-molecule inhibitors reduce white adipose mass and improve metabolic parameters without overt toxicity, positioning NNMT as a tractable target for metabolic-disease research [24]

Usually not dangerous, but blindly taking mega-doses because "more is better" isn't always smart either

Blood test to measure methylmalonic acid level