vitamin b12 injection iv dose Injections: Ideal Dosage & Frequency for Men's Health B12 Injection Dosage and Frequency:

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In fact, the Institute of Medicine recommends that adults aged 51 and over take vitamin B12 shots because they are more bioavailable than vitamin B12 found in oral supplements and foods

So my guess its to do with my stomach

This could be due to medical conditions like pernicious anemia or digestive disorders such as Crohns disease or celiac disease

Poor dietary intake of B12-rich foods, such as meat, fish, and dairy products, is one of the most common causes of vitamin B12 deficiency