Vitamin B12 plays a vital role in maintaining energy levels, supporting brain function, and ensuring the production of healthy red blood cells
These include the outer surface of the upper arm, the upper area of the front of the thigh, the abdomen (two inches from the belly button), and the buttocks (MedlinePlus, 2021)
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They also use it to inject a small amount of testing drug inside the skin, also known as intradermal injection for tuberculin skin test (TST), to find out if the patient is afflicted with tuberculosis or not
As NAD+ levels drop with age, so does mitochondrial function, DNA repair, and your bodys ability to manage inflammation and oxidative stress