pain in arm after b12 injection How to self-inject intramuscular vitamin - Overview B12 Injection for Tendinitis Pain
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You're experiencing any kind of infection
It can be frustrating to eat well and still feel off, which is why getting to the bottom of the issue is so important

Diagnosis, Treatment and Long-Term Management of Vitamin B12 Deficiency

According to an article about cobalamin deficiency in Tufts Universitys catnip newsletter, people with cobalamin deficiency also experience changes with intestinal permeability and absorptive function

Hydroxocobalamin is another effective form, often used for injections and known to have a prolonged effect in the body