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Vitamin B12 injections are not for the faint of heart, though, as they must be inserted in thick, deep muscular tissue in order to work
doi: 10.3109/09513590.2015.1014784
Brain 140 , 24152425 (2017)
Phase 2b doses were 0.25 to 1.0 mg daily, which at a 2.5 mg/ml concentration means 0.1 to 0.4 ml per injection, conveniently measurable on a 1 ml insulin syringe
