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Vitamin B12 deficiency can cause fatigue, memory and cognitive loss, myalgias(leg and back pain), poor digestion, mood changes, hair loss, weight gain due to poor metabolism
Allow the site to dry
Vitamin B12 Injections: How They Work Vitamin B12 injections are typically administered through a shot, usually into the muscle, although they can also be given subcutaneously (under the skin)
Some people may be allergic to certain compounds in cyanocobalamin, making them unsuited for the injections.
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