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HRV and skin temperature track overnight testosterone synthesis directly. Deep sleep and slow-wave sleep are when LH pulses peak — Oura captures both in a single readiness score that Helian uses to adjust your AM stack.

Body Battery and HRV Status reflect accumulated recovery debt. When Body Battery is consistently below 50, Helian increases ashwagandha and phosphatidylserine in your PM stack to protect cortisol clearance.

Resting heart rate elevation across a week is a reliable early marker of elevated cortisol. Sleep stage data — particularly REM and deep sleep ratio — is used to calibrate melatonin and magnesium dosing.

Android health aggregator (Android 9+). Pulls HR, sleep, and activity from Samsung Health, Pixel Watch, Mi Band, and others in a single OAuth connection — no separate setup per device.

Dietary zinc, fat, and vitamin D intake directly influence testosterone synthesis. Low dietary fat suppresses testosterone synthesis. Linking MFP lets Helian adjust recommendations based on your actual intake — not population averages.

Training load directly affects testosterone-cortisol ratio. Overtraining → elevated cortisol → suppressed testosterone. Strava training load data lets Helian increase recovery-support ingredients on heavy training days.

Micronutrient tracking at the ingredient level. Cronometer's detailed zinc, magnesium, vitamin D, B12, and selenium data is the most specific dietary input for calibrating supplement dosing to your actual diet.

Deep sleep and SWS duration drive nocturnal LH pulsatility — the hormonal signal that triggers overnight testosterone synthesis. Eight Sleep's sleep stage data gives Helian the most accurate overnight T-production signal available outside a lab.

Recovery and strain scores pair directly with circadian stack timing. Low WHOOP recovery (<33%) is used to flag high cortisol load days — Helian increases adaptogen support in your PM stack automatically.

The Polar H10 chest strap gives the most accurate consumer HRV measurement available — more accurate than wrist-based sensors. Useful for confirming true HRV baseline before adjusting adaptogens.

Skin temp, HRV, and RHR in a ring without a subscription fee. If you want Oura-quality circadian data at lower ongoing cost, Ultrahuman is the closest alternative.

SpO2, HRV, and body composition from the ScanWatch or Body Comp scale. Weight and body composition variance is used to track sarcopenia risk in the longevity profile.

Export your full Apple Health archive — includes HRV, sleep, RHR, activity, and VO2 max from Apple Watch, Withings, or any HealthKit-compatible device. One export pulls everything at once.

Samsung Health data via CSV export. Works on Android — download your data from Samsung Health → Settings → Download Personal Data.

Continuous glucose monitoring reveals insulin resistance patterns that suppress testosterone. High glucose variability in the AM is correlated with SHBG elevation and lower free testosterone.