NutritionBulk.com - Vitamin B12 1% Cyanocobalamin is pharmaceutical-grade with no fillers. Vitamin B12 is an essential vitamin. This means that the body requires vitamin B12 to work properly. Vitamin B12 can be found in foods such as meat, fish, and dairy products. It is often taken in combination with other B vitamin, and can treat and prevent vitamin B12 deficiency.