PRYSM iO is a cutting-edge, non-invasive device that measures the levels of carotenoid antioxidants in your skin using Spectral Rai Spectroscopy. It works by emitting a low-energy light onto the skin, which interacts with the carotenoid molecules in your skin, causing them to reflect a specific wavelength of light. This reflection is then measured to generate an antioxidant score, providing a real-time, objective view of your nutritional status. No blood draw or lab work is needed.