The severity of the deficiency, any health conditions, and how well the treatment works are all important
That is an important framing for anyone tempted to treat it as a shortcut: even in the animal work that generates the interest, the compound is one input alongside energy balance, not a replacement for it
Salinas et al 27 The traditional treatment of vitamin B 12 deficiency is the intramuscular injection of cyanocobalamin, generally, 1 mg/d for 1 week, followed by 1 mg/wk for 1 month, and then 1 mg every 1 or2 months ad perpetuum
The guidelines are for people at high risk to be screened with a routine blood test at least once a year
Health Canada warns that individuals should not buy or use unauthorized drugs, and should only buy prescription drugs from licensed pharmacies