Dr Andrew Huberman discusses the hormones testosterone and estrogen and how they impact the brain, body, and behavior. Dr Rajani Reacts. He also discusses a simple trick to impact these hormones and their levels. Dr Huberman reveals a breathing technique and jawline hack that strengthens and chisels the jawline via various mechanisms including hormones. Hormones are activated in particular ways it drives our endocrine system and vascular system to activate or repress certain hormone networks in predictable ways. Dr Rajani reacts to the peer-reviewed studies and protocols addressing twin studies that Dr Huberman presents eloquently and can positively or negatively impact testosterone and estrogen and in turn the jawline and well being.