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[4] It is also possible to supplement with vitamin B12

Increased concentration of transcobalamin I in a patient with metastatic carcinoma of the breast

In fact, according to the National Institutes of Health (NIH) , approximately 12.5% of people may have borderline low levels of B12, indicating vitamin B12 insufficiency

Potential Side Effects and Safety Considerations Vitamin B12 injections are usually safe but can have side effects

Specifically, this nutrient: Because it is involved in so many bodily functions that correlate to healthy energy levels, B12 is sometimes known as 'the energy vitamin.' When people don't get enough B12 through diet alone, they are likely to suffer from ailments such as megaloblastic anemia

Also, if there is no clinical data for a substance, and an awareness that the substance has the propensity for harm, that could make it an appropriate placement on the Category 2 list. Are They Safe