Like other B vitamins, vitamin B12 (also known as cobalamin) is important for your metabolism. It also helps in the formation of your body’s red blood cells and in the maintenance of your central nervous system. These foods contain vitamin B12: 1  Eggs. 2  Fortified foods, such as soy milk.3  Meat. 4  Milk and milk products.5  Organ meats, such as liver and kidney. 6  Poultry, such as chicken and turkey. 7  Shellfish, such as crabs, lobster and shrimp.hese foods contain vitamin B12: 1  Eggs. 2  Fortified foods, such as soy milk. 3  Meat. 4  Milk and milk products. 5  Organ meats, such as liver and kidney. 6  Poultry, such as chicken and turkey. 7  Shellfish, such as crabs, lobster and shrimp.