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Vitamin B12, also known as cobalamin, is a water-soluble vitamin that plays a pivotal role in the functioning of the brain and nervous system , as well as the formation of red blood cells

Importantly, the various diets contained identical fiber and protein content and varied primarily by the percentage of fat- and carbohydrate-derived kilocalories

In some cases, these breakouts could be due to a lack of the vitamin Biotin

In clinical practice, B12 injections are administered intramuscularly, usually into the deltoid or gluteal muscle

The daily injection requirement deters some patients but provides steady levels without the peaks and troughs of weekly dosing

Risk is higher with certain diets or meds affecting absorption