where do they put b12 injections at Home - Safety Guide for Self-Administration B12 Injection Dosage and Frequency:

This was exemplifi ed by the fact that urinary excretion of methylcobalamin was one-third less that of cyanocobalamin.[1] Another point of interest regarding B12 supplementation is the commonly held belief that intramuscular injections of B12 are more effective than oral supplementation

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Do not use in combination with tetracyclines

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. Doctors may not be prescribing oral vitamin B12 formulations because they may be unaware of this option or have concerns regarding its effectiveness Objectives: To assess the effects of oral vitamin B 12 versus intramuscular vitamin B 12 for vitamin B 12 deficiency. Selection criteria: Randomized controlled trials (RCTs) comparing the effect of oral versus IM vitamin B 12 for vitamin B 12 deficiency