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Cobalamin supplementation alters the Firmicutes and Proteobacteria populations within the GI tract of C3H/HeOuJ mice Cyanocobalamin supplementation at 40 g/ml in drinking water caused a shift in microbial composition in the cecum and colon, but not ileum, favoring Proteobacteria species and altering the dynamics of the low-abundance Firmicutes (Figs

The liver stores vitamin B12, sometimes in amounts sufficient for years, which is why deficiency can develop slowly

This bypasses the digestive system, making injections especially effective for individuals with absorption challenges

Patches absorb slowly through the skin, so they work better for mild support rather than treating serious deficiency

What Does Assay Testing Measure