Clair Tracks Hormones Through Your Skin, Not a Blood Draw
Clair is a continuous hormone monitor worn on the wrist, tracking estrogen, progesterone, LH, and FSH without blood tests.
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Clair Tracks Hormones Through Your Skin, Not a Blood Draw
Checking hormone levels has usually meant a
blood draw, a lab visit, or an at-home urine test read once and thrown away.
Clair Health built Clair as a continuous hormone monitor worn on the wrist,
tracking estrogen, progesterone, LH, and FSH in real time without any of that.
The company describes Clair as designed for women, by women, and states its
team draws individual experience from companies and institutions including
Whoop, Apple, Stanford Medicine, Meta, and Johnson & Johnson.
Reading Hormones Through the Body's Own Signals
Clair's approach rests on the fact that
hormones produce measurable physical effects elsewhere in the body. According
to the company, progesterone raises body temperature, shifts heart rate, and
changes sleep patterns, while estrogen affects cardiovascular tone and heart
rate variability. Clair's sensors capture more than 130 biomarkers spanning
cardiovascular, temperature-related, nervous system, and skin-based signals.
Machine learning models, trained against clinical-grade hormone measurements,
then work to decode that combined pattern of signals into a read on hormone
levels.
Treating Hormones as the Main Signal, Not Background Noise
Clair positions itself specifically against
fitness wearables like Oura, Whoop, and Apple Watch, arguing that those devices
treat hormone-driven changes in the body as noise to filter out rather than
something worth measuring directly. As an example, the company points out that
a 12% drop in heart rate variability during the luteal phase of a woman's cycle
can look identical to a recovery problem to a standard fitness algorithm, when
it may simply reflect normal hormonal change. This is Clair's own framing of
the difference, not an independent evaluation of competing products, but it
explains why the company built its models around hormone signals specifically
rather than adapting an existing fitness algorithm.
One Device Instead of Three Separate Tools
Clair states that many women currently piece
together their own hormone picture using three separate tools: a calendar app
to estimate cycle timing, at-home urine test strips for hormone snapshots, and
a fitness wearable for everything else. Clair combines these into one wearable
and one app, with hormone tracking as the central feature rather than an
add-on. Because it tracks actual physiological signals in real time rather than
predicting based on a calendar, the company states this also makes it accurate for
women with irregular cycles, where calendar-based predictions typically
struggle. Alongside hormone data, Clair also produces standard wellness metrics
like sleep, recovery, daily activity, heart rate, and HRV, generated from the
same underlying sensor signals.
What's Been Tested So Far
Clair states its hormone estimates and cycle
phase readings were validated against FDA-registered at-home hormone tests, and
that early research was presented at the peer-reviewed HHS National Conference
on Women's Health. The company also states further studies are underway,
including one through the Stanford Gladstone BeeHive Initiative, aimed
specifically at training and validating its production hardware. Clair's own
team draws individual experience from the companies and institutions listed on
its site, though this reflects the backgrounds of individual team members
rather than formal institutional partnerships between those organizations and
Clair itself.
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