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NNMT catalyzes the transfer of a methyl group from S-adenosylmethionine (SAM, the universal methyl donor in cells) to nicotinamide (a form of vitamin B3 and a precursor for NAD+ synthesis), producing 1-methylnicotinamide and S-adenosylhomocysteine (SAH)

This is one reason why manufacturers specify dark storage conditions

The practical result is that the body starts preferring fat as its primary fuel source even during moderate activity

However, only 22% of the variation in MMA levels was explained by vitamin B12, estimated glomerular filtration rate, age, sex, and socioeconomic status, suggesting that other underlying disease was likely the reason for elevated MMA levels