Vitamin B12 injections have multiple benefits.
Methylcobalamin (Vitamin B12) is an essential water-soluble vitamin that the body uses to maintain healthy nerve cells, produce RNA, DNA, and red blood cells and help iron to function properly.
B12 also works with folate to produce the amino acid SAMe which controls mood and supports immune function. B12 injections have many benefits and are often prescribed for deficiencies that cause fatigue, shortness of breath, diarrhea, numbness, and neurological damage.
Absorption and Availability
A B12 deficiency can result from a lack of intrinsic factor, a substance needed to absorb B12. One of the benefits of B12 injections over oral supplements is their immediate availability to the body. Injections that go directly into the bloodstream bypass absorption barriers according to the National Institutes of Health (NIH) and can help people with malabsorption issues like those who have intestinal disorders or have undergone intestinal surgeries.