🔬 Health & Fitness Research
Menstrual blood biosensors could complement cycle-tracking features on Oura Ring 4, Whoop 4.0, and Garmin Fenix 8 Pro—but they’re pre-commercial femtech in a different form factor. Adjacent R&D that signals where health tracking could head, but not a near-term threat to wrist-worn flagships.
Marty’s Take:
The race among Oura Ring 4, WHOOP 4.0, and Garmin Fenix 8 Pro to integrate menstrual cycle tracking has always been hampered by a fundamental problem: they’re inferring hormonal state from proxy signals like HRV and skin temperature. In-pad diagnostics that read actual inflammatory and metabolic markers from menstrual blood will expose that gap — and force the next generation of fitness trackers to either acquire biomarker partnerships or cede ground to clinical devices.
Shop mentioned gear: Garmin Fenix 8 Pro | Oura Ring 4 | Whoop 4
Source: Nature
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