Once available only to top athletes in clinics, Lumen makes lab-level metabolic testing accessible. It’s the first-ever portable device validated to measure metabolism by tracking the CO₂ concentration in your breath. Lumen reveals your body's fuel source, guiding you toward optimal metabolic health, so you can manage your weight, increase your energy, and discover a healthier you. This is brand new in an unopened box. Visit Lumen.com to see everything you need to know about this.