B12 is an essential vitamin that your body needs to make health red blood cells and maintain your nervous system. But, not all B12 is the same. When you are deficient in B12 it can effect mood, energy, and even fertility. I have found it to be a great adjunct therapy for conditions that effect the nervous system like fibromyalgia, restless leg syndrome, and even shingles. When used in conjunction with a regular exercise program and healthy eating habits then it can provide the body with the energy it needs to perform at it’s best.