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Description
Because the body cannot make B12 on its own, it has to come from food (meat, fish, eggs, dairy) or from supplements

S5A) and portal vein (Fig

(2005) A unified model for predicting human hepatic, metabolic clearance from in vitro intrinsic clearance data in hepatocytes and microsomes Drug Metab Dispos 33

Once opened, it should be discarded

Vitamin B12 supplementation helps support normal metabolism, healthy red blood cell production, appetite, growth, recovery, and nervous system function, particularly during periods of increased nutritional demand or deficiency