Injectable B12 comes in 2 forms: Short-acting B12 (Multine B12, Prolaject B12, Prolavax)- these are shortacting products and we would expect supplementation to last 3-4 weeks
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Anyone who wishes to embark on any dietary, drug, exercise, or other lifestyle change intended to prevent or treat a specific disease or condition should first consult with and seek clearance from a physician or other qualified health care professional
If you have normal B12 levels, an injection is unlikely to make you feel noticeably different