how deep should a vitamin b12 injection go Best Site: Administering B12 Shots How to Inject Vitamin B12
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Retrieved from [4] Selhub J, Paul L

Phase Initial 4 weeks Daily Dose 300 mcg Volume 0.18 mL Units (U-100) 18 units Phase Maintenance (weeks 5-12) Daily Dose 500 mcg Volume 0.30 mL Units (U-100) 30 units Phase Optional extension Daily Dose 300-500 mcg Volume 0.18-0.30 mL Units (U-100) 18-30 units This summarizes the published research-context dose range (commonly cited 300-500 mcg/day)

These can make daily life hard, as B12 is key for energy and brain health

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Others spread the daily dose into 2-3 doses, taken in the morning and prior to physical exercise, in both cases on an empty stomach
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