In this Huberman Lab Essentials episode, Dr. Andrew Huberman elucidates the powerful influence of thyroid hormone and growth hormone on human metabolism. He explains the intricate brain-body pathways that regulate these hormones and their critical roles in tissue growth, repair, body composition, and energy production. The discussion highlights essential nutrients like iodine, selenium, and L-tyrosine for optimizing thyroid function. Furthermore, listeners will learn about practical tools such as exercise, sleep, meditation, and specific sauna protocols to enhance growth hormone levels and counteract age-related declines, providing actionable insights for improving overall metabolic health and well-being.