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It's when your body can't make intrinsic factor, the protein needed to absorb B12
14 day return policy LAboratory quality Safe shopping Opinions Olha Everythings fine the product matches the description, so Id recommend it
Readers should weigh that the company is the commercial competitor of the compounders it is describing
B12 is only found in animal products (meat, eggs, shellfish, dairy), making deficiency especially common among vegans and vegetarians
[Crossref] Weisberg I, Pamela Tran P, Christensen B, Sibani S, Rima Rozen (1998) Second Genetic Polymorphism in Methylenetetrahydrofolate Reductase (MTHFR) Associated with Decreased Enzyme Activity
