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However, in some cases, there are instances in which they signal a potentially critical medical condition
A single injection can send a serum level into the thousands and keep it elevated for weeks or months
It is used as a performance-enhancing drug and is banned by the World Anti-doping Agency
Because of how vitamin B12 is absorbed, the most common risk factors for B12 deficiency are: Genetic susceptibility : Some people genetically produce less intrinsic factor and stomach acid needed for B12 absorption
Substrate specificity of nicotinamide methyltransferase isolated from porcine liver (in Eng)
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