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doi: 10.1056/NEJMra0804615

In persons with intestinal lesions such as jejunal diverticulosis or some anatomical abnormalities with bacterial overgrowth (e.g., fistulas and blind-loops), vitamin B12 deficiency may develop because bacteria in the colon competitively utilize all the available vitamin B12 (Cooke et al., 1963)

Vitamin B12 is typically found in food groups such as meats, such as poultry, fish, red meat, and even dairy products

Always swab the injection site and the vial's rubber stopper with an alcohol pad before every single injection

Am J Physiol Endocrinol Metab 284:E1149E1155

This is not dangerous, but your dose volumes will be larger than expected