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vitamin b12 injection im site Sites: All You Need to Know B12 vitamin Store Intramuscular vs
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[DOI] [PMC free article] [PubMed] [Google Scholar] 41.Lokhorst HM, et al

The intrinsic factor then binds with B12, facilitating the uptake of B12 in the small intestines.[ref] Without intrinsic factor, you cant absorb B12 from animal proteins
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Fat-soluble hormones work by entering your cells and diffusing across the plasma membranes to bind with your DNA
