what are b12 injections good for Shots: Vitamin B12 Benefits, Uses, Risks Vitamin B12 Injections for Energy,
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[DOI] [PMC free article] [PubMed] [Google Scholar] 224.Yao, H

In the case of pronounced absorption disorders, for example as a result of gastritis or after removal of the small intestine, in Crohn's disease, diverticulosis and the so-called blind-loop syndrome, there is a gradual decrease in the vitamin B12 store in the liver, which can turn into a manifest vitamin B12 deficiency

But controlled human efficacy data is sparse, and the single Phase 2 trial tested oral administration rather than the subcutaneous injection most users employ today

The impact of vitamin B12 shots goes beyond mere supplementation

It's main mechanistic outcomes are Targeted fat loss: Designed to promote lipolysis (fat breakdown) and inhibit lipogenesis (fat formation)