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b12 injections and weight loss side effects Does Vitamin Promote Loss? Vitamin B12 shots: Uses, benefits,
Description
The following factors may increase the likelihood of having a B12 deficiency
It is a synthetic small molecule

and if shelf life is 28 days, and I am to inject this into his subq once a week

In rare cases, patients might experience nausea, itching, and headaches

However, the oral route cannot be excluded as it did not depend on intrinsic factors only, as the simple diffusion (without the need for intrinsic factors) is now considered another mechanism for the absorption of vitamin B12 [49, 50]