nhs b12 injection guidelines Experiences with vitamin deficiency and reactions in alpha 1 antitrypsin deficiency Vitamin B12 Injection Service -
Description
The products that are shipped to the US have an FDA-compliant labeling in English

Vitamin B12 injections are widely prescribed to treat vitamin B12 deficiency, neuropathy, anemia, diabetic neuropathy, and neurological disorders

see the next question for why

In addition to keeping blood and nerve cells healthy, it contributes to the effective functioning of several critical bodily processes, including energy metabolism

According to StatPearls (NCBI Bookshelf), the most common adverse effect of intramuscular vitamin B12 injections is significant pain at the injection site, which is particularly noted in thinner individuals
