NT Factor® Advanced Physician's Formula with B-Vitamins 150 TabletsNT FACTOR ADVANCED PHYSICIANS FORMULA WITH B VITAMIN COMPLEX is a pure form of NTFactor mixed with a complex of B vitamins. Made up entirely of food and food extracts, it is just about the safest way to regain your youth. NT FACTOR ADVANCED PHYSICIANS FORMULA WITH B VITAMIN COMPLEX works by keeping your cells healthy, and fueling your mitochondria, the powerhouse of your cells. The ability to convert food and oxygen to energy begins in your cells.