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312 wearable-wearing professionals. 90 days. Four device categories tested. By day 30, our cohort looked like every Reddit thread on r/VagusNerve. About a third saw HRV gains. The rest didn't. By day 90, the picture had collapsed. One intervention category produced sustained autonomic-tone shift across wearables. Three others (neck-based stimulators, haptic wristbands, breathwork-only controls) converged toward baseline. The auricular branch of the vagus nerve sits 1 mm beneath the skin at the ear. At the side of the neck, the same nerve sits 20 mm below muscle. Same nerve. Two completely different stimulation problems. The device that survived day 90 was the only one built to the 20-minute auricular protocol JAMA Internal Medicine validated in 2024. That device is what we ship. 60-night home trial. Read the full cohort data →