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The frequency of B12 injections depends on individual needs and the severity of any deficiency

Several autoimmune diseases can make it harder for your body to absorb B12, including pernicious anemia

Vitamin B12 is needed to create red blood cells and is vital in the function and development of brain and nerve cells, your central nervous system

While additional studies are needed to determine whether elevated vitamin B 12 status may be related to cancer development, including evaluating whether it might be a potential marker of cancer, it is important for observational studies to adequately control for potential confounders, such as age, menopausal status, alcohol use, and intake of the B-vitamin folate