Methylcobalamin is a tissue-ready form of vitamin B12. It supports cardiovascular function, normal sleep cycles, blood cell function, and nerve function. Most B vitamins do not remain stored in the body, so they must be acquired daily from the diet to help maintain optimal health. Therefore, supplementing with tissue-ready B vitamins is important to everyone, especially individuals who might not be able to convert non-active B vitamins to their active forms in the liver.