At 21, Jenny Duan saw what Oura and WHOOP missed: women's hormones. She raised $11.6M from Khosla Ventures to track them — TFN

Clair Health, a San Francisco-based startup, has raised $11.6 million in seed funding led by Khosla Ventures. The company plans to launch the first noninvasive, continuous hormone monitor for women in November 2026.

Clair’s device uses 10 biosensors and more than 130 biomarkers to track estrogen, progesterone, LH, and FSH in real time, all without blood draws or needles.

Early testing has already identified nine unique sub-phases in the female hormone cycle, challenging the long-standing four-phase model used in women’s health.

Women were not required to be included in US clinical trials until 1993. Jenny Duan learned this as an undergraduate at Stanford, and it stuck with her.

That realisation led to Clair Health, a San Francisco startup that she co-founded with Abhinav Agarwal after they met at Stanford in the spring of 2025. The company, working on what it calls the first noninvasive, continuous hormone monitor for women, just closed $11.6 million in seed funding to bring the product to market.