Learn more about Cortisol, your body's master hormone the under-appreciated factor that affects every field of medicine. Cortisol is the key hormone that helped early humans flee predators hundreds of thousands of years ago. These days, we're no longer fleeing life-threatening predators, but our bodies still use the same hormone to warn us about modern threats - what we refer to as stress. Working with the research and insights nearly 100 of the world's best scientists in their respective fields, CORTISOL, THE MASTER HORMONE will help you figure out how to get the data you need to live your best life, and to always understand how your stress levels are impacting your sleep, brain function, blood pressure, bones, gut, appetite, weight, immune system, and aging. Consider this: Find out how you can protect your health and stop guessing. Read CORTISOL, THE MASTER HORMONE today!