Health Guides
Sleep science, nutrition timing, supplementation, and evidence-based wellness guides for peak performance.
Sleep Cycle Science: How to Wake Up Feeling Rested
Learn how 90-minute sleep cycles, REM timing, and sleep debt affect cognitive performance. Use our Sleep Cycle Calculator to find your ideal bedtime.
Caffeine Half-Life: The Science of Optimal Timing for Energy and Sleep
Caffeine's half-life is 5–7 hours. Learn how it disrupts sleep, how to time it for peak performance, and use our calculator to find your personal cutoff.
Vitamin D Deficiency: How Much Do You Actually Need?
Over 40% of US adults are vitamin D deficient. Learn optimal blood levels, how much sun exposure you need, and evidence-based supplementation dosing.
How Much Protein Do You Actually Need? A Complete Guide
The RDA for protein is outdated. Learn evidence-based protein targets for muscle gain, maintenance, fat loss, and aging — and how to hit them daily.
Intermittent Fasting Windows: 16:8, 18:6, OMAD — Which Is Right for You?
Compare intermittent fasting protocols — 16:8, 18:6, 5:2, and OMAD. Learn the metabolic science, cognitive benefits, and how to find your optimal eating window.
Creatine Loading vs Maintenance Dosing: What Actually Works
Creatine is the most studied performance supplement. Learn the loading vs maintenance debate, cognitive benefits, timing, and how to calculate your dose.
Heart Rate Zones Explained: Zone 2 Training for Longevity and Performance
Zone 2 training is the foundation of elite endurance and longevity. Learn the 5 heart rate zones, how to calculate your zones, and why Zone 2 is the most important.
VO2 Max: The Single Best Predictor of Longevity (And How to Improve It)
VO2 max is the strongest predictor of long-term health and lifespan. Learn what it measures, how to estimate yours, and evidence-based strategies to improve it.
Electrolyte Balance: How Hydration Affects Brain Performance
Mild dehydration impairs cognitive performance by up to 20%. Learn how electrolytes work, how much you lose through sweat, and how to optimize hydration.