NT 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. Taken in combination with other nutritional supplements, it makes everything work better.