how often can you have a b12 injection Are Vitamin Shots Right for You? What is the recommended frequency
Description
B12 is mostly found in animal sources, leading to vegetarians and vegans often falling short in their levels
It seems likely, therefore, that long-term therapy is a significant risk factor for allergy to cobalamins used in the treatment of vitamin B12 deficiency

And its one where the chemistry gives a clearer answer than most compounds in this space

Anticancer Res

B12 Injections: Pros and Cons Vitamin B12 injections deliver the vitamin directly into the muscle, bypassing the digestive tract
