Heart Rate Variability measures the variation in time between heartbeats. Higher HRV indicates greater autonomic nervous system flexibility and is associated with resilience, fitness, and lower mortality risk.
Root Mean Square of Successive Differences — the gold-standard time-domain HRV metric. Reflects parasympathetic (vagal) tone. Healthy adults: 25–100ms. Elite athletes may exceed 120ms.
Even moderate alcohol (2+ drinks) suppresses HRV for 24–48 hours, reducing parasympathetic tone by 15–30%. This effect persists well past subjective intoxication.
2–3 minute cold water immersion (10–15°C) activates the dive reflex, acutely elevating vagal tone. Regular practice shows cumulative HRV improvements of 8–15% over 4 weeks.
The tools on this page analyze individual dimensions of health. Your Personalized Protocol synthesizes them into one evidence-graded action plan — built around your goals, your lifestyle, and peer-reviewed research.
Every recommendation rated A, B, or C based on clinical evidence strength.
Specific dosages, optimal timing windows, and form recommendations.
Each recommendation connects to compound profiles, tools, and in-depth reviews.
Based on your sleep optimization goals and reported stress levels, magnesium glycinate addresses both GABA receptor support and HPA axis regulation with strong clinical evidence.
Your HRV resilience profile suggests parasympathetic tone would benefit from structured breathwork. 5.5 breaths/min coherence breathing targets vagal activation directly.
Aligning your primary caloric intake with your metabolic window supports glucose clearance and lipid metabolism based on chrono-nutrition research.
Adaptogenic support for cortisol regulation aligned with your reported stress profile and recovery goals.
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