This Huberman Lab Essentials episode focuses on cortisol and epinephrine's impact on energy levels and the immune system. The podcast explains the hormones' release mechanisms and how sunlight exposure in the morning boosts cortisol for increased energy and focus. It then details how practices like cold showers or high-intensity interval training, while stressful, can improve immune function if managed correctly by maintaining mental calmness despite physical stress. Finally, it discusses the negative effects of chronic stress and suggests supplements like ashwagandha and apigenin to mitigate it. Listeners gain actionable strategies to regulate these hormones for improved energy, immune function, and stress management.