Lume Health is a San Francisco–based healthtech startup developing the first wearable capable of tracking hormone fluctuations in real time through a sweat sensor. Designed for continuous, needle-free monitoring, Lume replaces outdated lab tests with instant, actionable insights on stress, sleep, and energy at the cellular level. Targeting biohackers, athletes, and high-performing professionals, the device helps users understand and respond to their bodies’ hormonal shifts without waiting weeks for results. Early beta users report transformative benefits, from restored energy to improved well-being, positioning Lume as a potential game-changer in personalized health tracking.