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Critical Functions of B12 in the Body Vitamin B12 helps make red blood cells, supports the nervous system, and is needed for DNA

A deficiency of vitamin B12 often occurs when dietary intake is insufficient or when the body has issues with absorbing vitamin B12

That said, its not without risk

Model-dependent changes in markers of cellular energy status and oxidative-stress responses

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The profile of amino acids varies greatly among dietary sources, so unless youre a savvy protein combiner, youre probably not getting optimal amounts of all of them