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methylcobalamin Vitamin B 12 appears to have only two functions in eukaryotes: as a cofactor for the enzymes: Methionine synthase MethylmalonylCoA mutase Sources of vitamin B12 Vitamin B 12 is in the gastrointestinal tract of animals and is then absorbed by the host animal

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7 ClinicalTrials.govTrial registry search: no completed controlled human efficacy trials of the BPC-157 + TB-500 combination