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I also get tasked, probably due to my age
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
doi:10.3390/molecules191119066 Vukojevic J, Milavi M, Perovi D, et al
How to Give Yourself a B12 Shot (SQ) Heres how to give a B12 shot subcutaneously: Prepare for Injection To prevent infection, wash your hands before giving a B12 shot
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