Vitamin B-12 - Mayo Clinic
www.mayoclinic.org › drugs-supplements-vitamin-b12Jul 17, 2021 · Vitamin B-12 - Mayo Clinic By Mayo Clinic Staff Overview Vitamin B-12 (cobalamin) plays an essential role in red blood cell formation, cell metabolism, nerve function and the production of DNA, the molecules inside cells that carry genetic information. Food sources of vitamin B-12 include poultry, meat, fish and dairy products.