The standard research protocol is 300 mcg per day, subcutaneous, administered in a fasted state, typically in the morning before food or exercise
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Vitamin B12 Intramuscular Dosage for Deficiency Treatment The first dose for treating vitamin B12 deficiency is 1000 mcg (1 mg) per shot
Supports healthy aging: Keeps energy levels and cell activity strong as we age
The authors comment that overall this was a well-tolerated efficacious regimen [22]