allergic reaction to vitamin b12 injection Taiwanese doctor warns chronic deficiency can cause hives | Taiwan News 3 Rare But Serious Side

Cobalamin injections of 200250 g/wk initially, followed by 50 g/wk, alleviated the symptoms of anemia in women post-pregnancy

This pilot study suggest that the nasal drops may be used as an alternative to injections because two thirds of ME/CFS patients reported a positive effect, accompanied by an increased number of steps, improvement of the RAND-36 physical functioning scale and the CIS20r fatigue scale, and a significant increase in serum vitamin B12 levels

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Obstetrics and Gynecology Clinics, 48(1), 131-144

It should only be handled by professionals who are licensed and qualified