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When B12 is low, red blood cells become oversized and inefficient (megaloblastic anemia), and oxygen delivery to follicles drops
Current evidence suggests favorable tolerability at doses of 250mcg to 2mg administered subcutaneously, but investigators should monitor phosphate levels, glucose, and renal function to detect mechanism-based risks early
Higher does not equal better - it equals more expensive and more side-effect prone
2016 Apr;241(8):783-99
If you were prescribed B12 injections for a documented deficiency, your doctor will reassess whether the injection schedule needs adjusting
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