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Vitamin B12 Why it matters: Found naturally in animal foods, vitamin B12 regulates key metabolic processes in the body both directly and as a cofactor (or "helper molecule") for two enzymes (methionine synthase and L-methylmalonyl-coenzyme A mutase)
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Iron Supplementation at the Crossroads of Nutrition and Gut Microbiota: The State of the Art
The more magnesium retained by the body after loading, the greater indication of a functional deficiency
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