generic name for b12 injection Methylcobalamin (Vitamin B12) Veterinarians may prescribe vitamin B12 injections to animals with a deficiency Vitamin B-12 Injectable for Horses,
Description
Supplementing and boosting B12 via injection is the most effective way for your body to absorb Vitamin B12, and within 48 to 72 hours, your body will begin to make new red blood cells

For a comprehensive review, see reference (98)

Monitoring is generally unnecessary for those taking standard supplements

Supplementation of B12 for a number of weeks prior to supplementing methylfolate, will avoid reactions to methylfolate