is oral b12 as good as injections how much in injection The Advantages of Versus Supplements: Shawn Veiseh, M.D.: Family Medicine Vitamin B-12 Intramuscular Injection — – B12 Injection vs. Oral Supplements:

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Important limitations on this safety profile: the longest trial was 24 weeks, the total trial population is small by modern standards, and the clinical trials used oral dosing

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A pharmacokinetic study in rats found that oral administration produced substantial plasma concentrations, with a maximum concentration of 2252 ng/mL and an elimination half-life of approximately 6.9 hours