Lumen is the world’s first hand-held, portable device to accurately measure metabolism. I have been using mine most days since December 2023. Only top athletes, via hospitals and specialty clinics, used to have access available to metabolic testing. Now it is available to everyone at home and on the go. Lumen uses a CO2 sensor and flow meter to determine the CO2 concentration in a single breath. This indicates the type of fuel your body is using to produce energy and provides information on how best to structure your day nutritionally based on your daily results. The value Lumen delivers is immeasurable and has been an integral part of my health and wellness journey. I highly recommend this metabolic tool to help you on your journey too. LTKselfcare LTKActive LTKfitnessgoals