What if your health wasn’t limited by genetics — but by switches in your biology no one taught you how to control? In The Human Upgrade Book – Version 4.0, John Navarro reveals a root-cause framework to optimize energy, focus, and longevity using cutting-edge science and proven biohacking protocols. Inside, you’ll discover how to: Activate cellular switches that drive performance and prevent fatigue Unlock genetic insights to personalize your nutrition and training Apply hydration, fasting, and carnivore protocols for maximum results ❄️ Leverage cold, heat, and recovery science to supercharge resilience Whether you’re a health professional or just starting your optimization journey, this book is your blueprint for upgrading body and mind.