Commonly reported range Community sources describe oral doses of roughly 50150 mg per day anecdotal, not derived from any published human study
45 kcal% fat, 35 kcal% carbohydrate, 20 kcal% protein, Research Diets, Inc
Because the body is efficient at excreting excess B12 through urine, there is no established tolerable upper intake level (UL) for the vitamin
The disconnect between preclinical efficacy and human clinical outcomes remains unexplained and represents a significant limitation for potential therapeutic applications
Instead this vitamin is usually absorbed as part of a healthy and balanced diet, with B12 being found in meat and eggs as well as fortified cereals, fish and cheese
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