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Negative experiences include occasional reports of gastrointestinal upset, particularly nausea and dizziness
It uses a methyl group donated by S-adenosylmethionine (SAM) to methylate nicotinamide a vitamin B3 form that would otherwise be recycled back into NAD+
Those who follow a vegetarian or vegan diet may have trouble getting enough B12 from food alone
Values are approximations based on published gastric emptying research and Widmark-adjusted absorption modelling
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