what does b12 injection contains VITAMIN Compounded Methylcobalamin (Vitamin B12) Injection,
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Niacin: Fact Sheet for Health Professionals

Dont worry if you dont know how to change your diet

High doses of B12, often used to treat deficiencies, may cause side effects such as headaches, nausea, diarrhea, fatigue or weakness, and tingling in the hands and feet

The amount of time it takes to build up vitamin B12 levels in the body can vary depending on the severity of the deficiency and the method of treatment
