Vitamin B-12 is fundamental in many aspects of human function such as cardiovascular and cellular operation, nervous system structure, and general metabolism. Blast B-12 is the oral equivalent to receiving a vitamin B-12 injection. It is energizing without the nervous side effects some supplements cause. Vitamin B-12 works best when used in conjunction with B complex vitamins, such as those found in Stressed Out. Used together, the two not only provide their intended benefits, but also provide the additional benefit of a metabolism boost!