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Vegetarians and vegans especially need to be careful and consider supplements, as most common vitamin B12 food sources do not fit with these diets
S., Porter, J
The rapid increase in vitamin B12 levels produced by NASO B12 has resulted in a steady increase in hemoglobin levels.[] As absorption of vitamin B12 from NASO B12 bypasses the gastrointestinal tract in which the mechanisms of metformin-induced vitamin B12 deficiency are proposed and take place from the nasal epithelium
Panteli M, Pountos I, Jones E, Giannoudis PV
The duration and sustainability of the effects from B12 injections depend significantly on individual factors, such as metabolic rate and the level of B12 deficiency
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