when to switch from injectable vitamin b12 to oral Efficacy of different routes of supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis Vitamin B12 Injections: What You

Patients who are experiencing less severe symptoms may start on once-weekly injections

Additionally, a randomized, double-blind, placebo-controlled trial in 2,588 healthy older adults with mild hyperhomocysteinemia found that daily supplementation with 500 g of vitamin B 12 and 400 g of folic acid for two years reduced blood homocysteine concentrations but had no benefit on depressive symptoms in those with or without depressive symptoms at baseline (110)

With advancing age, B 12 absorption declines, and a higher supplemental B 12 dose may be needed

A few hours forgotten on a counter can significantly reduce remaining potency

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