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It can also be used to identify tinnitus pitch, loudness, and other qualities that could help guide therapy

Still, the benefits of treating deficiency usually outweigh the increased chance of bruising
How is a B12 shot different than taking an oral supplement

Vitamin B12 supports healthy nerves, red blood cell formation, and normal energy production

Chiu CK et al., J Neurol Sci 2011 High-dose methylcobalamin in ALS

A randomized, double-blind, placebo-controlled trial in 153 older adults taking the antidepressant citalopram found daily supplementation with 500 g vitamin B 12 , 2 mg of folic acid, and 25 mg of vitamin B6 for one year did not reduce the severity of depressive symptoms but increased the response to drug treatment and helped to prevent symptom relapse (112), suggesting B-vitamin supplementation might provide some benefit as an adjunct therapy