dangers of b12 injections Common Side Effects From Vitamin Shots Vitamin B12 Deficiency: Symptoms, Causes
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Studies have also shown that high vitamin B12 levels may be associated with a lower risk of having obesity Supplementing with B12 may contribute to improving symptoms such as: Blurred vision

Great question
It helps reduce symptoms like numbness, weakness, and nerve pain

At the moment, its only used for RESEARCH

6 Bartleson JD, Maus TP