b12 injections pain vitamin side effects why is so painful B12 Injection and Safety Benefits of Vitamin B12 Shots – B12 Shots & B12 Injections:

Concurrent Medications Concurrent medications can significantly influence the duration that a B12 injection lasts in the body

These include the severity of deficiency, patient age, and malabsorption issues

Any stomach disorders, or conditions like pernicious anemia where Intrinsic Factor is lacking, can prevent B12 absorption, as can intestinal inflammation such as Crohns disease if a damaged terminal ileum cannot take up vitamin B12

In fact, injections and infusions may be more beneficial for people deficient in B12 due to a digestive issue or because they are older and have less stomach acid

They usually last 30 minutes to an hour

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