Doctor's Best Fully Active B12 delivers 1,500 mcg of methylcobalamin, the active and highly bioavailable form of Vitamin B12, to help support healthy energy metabolism, nervous system function, cognitive performance, and red blood cell production. Unlike inactive forms of B12, methylcobalamin is readily utilized by the body without requiring additional conversion. This vegetarian-friendly formula is ideal for individuals looking to maintain healthy Vitamin B12 levels, especially those following vegetarian or vegan diets, older adults, or anyone seeking extra nutritional support.