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Malabsorption (insufficient absorption of vitamin B12 in the intestine) due to insufficient production of intrinsic factor (a protein produced in the lining of the stomach that is needed to absorb vitamin B12), disorders in the end section of the ileum (part of the small intestine), such as sprue, fish tapeworm infestation or blind loop syndrome (change in the course of the intestine after gastric surgery)

Understanding Methylcobalamin and Its Importance Methylcobalamin is a bioactive form of Vitamin B12, which plays a vital role in DNA synthesis, neurological function, and the formation of red blood cells

B12 injections may be especially relevant for people who follow a plant-based diet, have digestive issues, take certain medications, or struggle with nutrient absorption

Cant, C., Menzies, K

Common injection sites include the thigh, shoulder, and buttocks