Natures Plus Garden Source of Life Vitamin B12 is essential for energy and brain function. Each capsule provides 1000 mcg of vitamin B12. Vitamin B12 is necessary for red blood cell formation and a healthy nervous system. Maintain your B12 levels with this supplement. Composition Vitamin B12 (methylcobalamin), Cellulose, Magnesium stearate, Silica, Mixture of other ingredients. Instructions for use Take 1 capsule daily with a meal.