Clair Health raises $11.6M seed to build a wearable hormone monitor

What's the deal? Clair Health, a startup building a wearable hormone monitor for women, has raised an $11.6 million seed round led by Khosla Ventures. CEO Jenny Duan disclosed the funding exclusively.

The company is developing a device that tracks hormones through a wearable — a category that could give women real-time insight into fertility, menstrual cycles, and broader hormonal health.

Why now? Wearables giants like Oura and Whoop are pushing deeper into women's health, signalling growing consumer and investor demand for sex-specific health tracking. Clair Health is betting it can carve out a niche by focusing entirely on hormone monitoring — an area the bigger players haven't yet cracked.

What could go wrong? Hormone monitoring through a wearable is technically ambitious. Proving clinical accuracy will be essential to gaining consumer trust and potential regulatory clearance. And if Oura or Whoop move faster into hormonal tracking, Clair Health could face well-funded competition with larger installed user bases.

The signal: An $11.6 million seed is substantial for an early-stage femtech hardware startup, and Khosla Ventures' involvement lends credibility to the bet that noninvasive, continuous hormone monitoring can move from lab concept to consumer product. The round underscores a widening gap between investor appetite for women's health innovation and the still-limited number of startups tackling hormone tracking — a space where no wearable incumbent has yet delivered a proven solution.