how much b12 is in a b12 injection Vitamin Dosage For Adults: Comprehensive Guide Compounded Cyanocobalamin (Vitamin B12) Injection

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

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A randomized study

Supplementation of Folic Acid and Vitamin B12