What happened
Phira unveiled a behind-ear wearable that models estrogen, LH, and progesterone dynamics from skin temperature at 0.03°C resolution, not from blood or urine. The pilot: 12 women, 31 cycles, compared with daily urine. A larger study including PCOS and perimenopause is underway, launch targeted for 2027.
Evidence: Pilot validation study; n=12
What it means for practice
a temperature model that tracks cycle pattern is a real step, and the perimenopause data will be interesting. Twelve women for now, so it sits alongside the lab, not in place of it.
Originally published in The Longevity Medicine Intelligence newsletter (#105).


















