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A common synthetic form of the vitamin (cyanocobalamin) does not occur in nature, but is used in many pharmaceuticals, supplements and as food additive, due to its stability and lower cost
The good news is that some people notice improvements within a few days, particularly if they have a significant deficiency
First, when you take a pill, it has to be digested and metabolized through the liver or kidney through what is called the first-pass effect
Supplied in 30mL vials providing sufficient volume for repeated in vitro assay preparation
Heather K
arXiv preprint arXiv:math/0603291
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