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Getting the recommended daily amount of B12 can, therefore, help ensure that the body is able to make the energy it needs to do everything you need it to do

B12 shots are not likely to increase energy or exercise performance in people who already have normal B12 levels

Because B12 is involved in converting carbohydrates, fats, and proteins into adenosine triphosphate (ATP)the body's primary energy currencysome assume that supplementation will "boost metabolism" or increase energy expenditure

Some researchers also track NAD+ metabolite levels via urinary nicotinamide excretion to confirm functional NNMT inhibition, though this is not standard practice