Jenny Duan is on a mission to change the way women understand their bodies.
At just 21, the Stanford graduate and Co-Founder & CEO of Clair is building the world’s first non-invasive continuous hormone tracker—technology designed to help women decode the hormonal patterns that influence everything from energy levels to fertility.
Inspired by her early work advocating for women experiencing homelessness and domestic violence, Jenny saw firsthand how often women’s health concerns were dismissed or overlooked. Now, she’s using AI, wearable technology, and a deeply personal commitment to women’s health to close that gap.
In our conversation, Jenny shares the “aha” moment behind Clair, why women’s bodies have been misunderstood for far too long, and how better data could transform the future of healthcare for women everywhere.
What gave you the conviction that this wasn’t just an idea—but something women genuinely needed?
At Stanford, I was taking classes focused on women’s health and gaps in the healthcare system. I knew women’s health wasn’t prioritized—women weren’t even included in clinical trials until 1993, and this has created a deficit we have now where 30% of women have irregular cycles, one in seven have PCOS (with 70% living undiagnosed), and one in six are experiencing infertility. Yet even knowing these stats, there are few resources that are available to fill the gap.
The technology had finally reached a point where continuous hormone tracking could become reality, and it felt like a now-or-never moment. Women have already waited decades for better tools. Every year of delay is another year without access to understanding their own biology and how to live with it.
Wearables have been collecting data for years—but you saw something missing. What was the “aha” moment when you realized hormonal patterns could be decoded from existing signals?
The ‘aha’ moment was recognizing that wearables had been collecting helpful data for years—heart rate, temperature, HRV—but the algorithm hadn’t been made to translate those signals into hormonal insights or view them from the lens of a woman’s ever-changing hormones.
What my co-founder, Abhinav, and I understood was that no single metric could capture something as dynamic as hormonal fluctuations, which happen every 24 hours for women. Abinav’s experience working in wearables helped us build out the core technology. [At] the core of what Clair’s technology does: it takes the signals the body has already been broadcasting and makes them readable.
What does Clair unlock that women haven’t had access to before?
Continuous hormone tracking unlocks the ‘why’ behind how women feel day to day. Until now, women could only get a picture of their hormones via an invasive test like blood, urine, or saliva samples, and even then, it was only a snapshot of their ever-changing hormones. But hormones don’t operate on a schedule or an assumed pattern. Continuous monitoring changes this and enables women to not only see how their hormones are fluctuating, but to learn how to live with these patterns.
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