why does my arm hurt after b12 injection Preventing Pain a Flu Shot What Happens When You're Allergic

Common side effects are usually mild and temporary

Trends in Endocrinology and Metabolism (2017) 8

It's when your body can't make intrinsic factor, the protein needed to absorb B12

Many are unsure if they are at risk of a vitamin B12 deficiency, if you are wondering if you are or what the symptoms may be to look out for, individuals with a vitamin B12 deficiency may include: Elderly Anyone who may have had previous surgery that included removing part of the bowel that absorbs vitamin B12 Any individual on metformin for diabetes Anyone that is following a strict vegan diet Anyone taking long-term antacid medication for heartburn What is Vitamin B12