Nu Skin Prysm iO™Nu Skin PRYSM iO Personal Antioxidant Wellness Scanner The Nu Skin PRYSM iO is a portable wellness device that gives you a quick insight into your bodys antioxidant levels. In just seconds, it scans your skin to measure Carotenoids powerful antioxidants that help protect your body from oxidative stress caused by poor diet, lack of sleep, stress, UV exposure, and other lifestyle factors. Using advanced light technology and smart algorithms, PRYSM iO