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The vitamin is administered in the office via injections

B12: The Basics B12 is a water-soluble vitamin that plays a role in red blood cell formation, metabolism, immune health, DNA synthesis, and brain and nervous system functioning

Treatment The injection is typically administered into the deltoid (shoulder), vastus lateralis (thigh), or ventrogluteal (side of the hip) muscle

Find out what research suggests in the B-5 (Pantothenic Acid) section of our B Vitamins Supplements Review

Risk factors associated with B12 deficiency include following a vegan diet, aging, some medications and specific medical conditions