To help bypass any barriers to absorption in the GI tract, many healthcare providers recommend B12 injections for deficiency, but research shows that very high doses of oral B12 (1,000 to 2,000 mcg once a day) can normalize serum B12 levels to a similar extent with minimal side effects
J Obes Metab Syndr 2021;30:3205.ArticlePubMedPMC 99
American Health & Drug Benefits
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How to make injections painless (advanced techniques) Go from tolerating injections to barely feeling them