In this Huberman Lab Essentials episode, I explain how two key hormones control metabolism and discuss tools to enhance their levels to improve metabolic health. I discuss the pathways through which the brain and body interact to produce thyroid hormone and growth hormone, and how these hormones influence essential processes like tissue growth and repair, body composition, and energy production. I explain how thyroid hormone levels are influenced by key nutrients, such as iodine, selenium, and L-tyrosine. I also explain how practices such as exercise, sleep, meditation and sauna can offset age-related declines in growth hormone, to optimize overall hormone health and metabolism. Episode show notes: https://go.hubermanlab.com/NiHUHED Huberman Lab Essentials are short episodes focused on essential science and protocol takeaways from past full-length Huberman Lab episodes. Watch or listen to the full-length episode: https://youtu.be/x7qbJeRxWGw Watch more Huberman Lab Essentials episodes: https://youtube.com/playlist?list=PLPNW_gerXa4OGNy1yE-W9IX-tPu-tJa7S *Timestamps* 00:00:00 Huberman Lab Essentials; Hormones & Metabolism 00:01:41 Hypothalamus, Pituitary, Thyroid 00:03:22 Thyroid Hormone Functions, Tools: Iodine, Selenium, L-Tyrosine 00:07:55 Thyroid Hormone, Glucose & Metabolism; Thyroid Hormone Disorders 00:10:14 Growth Hormone Functions, Prescription Growth Hormone 00:13:10 Growth Hormone Release, Tools: Sleep & Bedtime Fasting 00:14:35 Growth Hormone Release, Tools: Meditation; Exercise, Warm-Up, Glucose, Cool Down 00:19:30 Growth Hormone Supplements, Arginine 00:21:31 Offsetting Age-Related Growth Hormone Decline 00:22:30 Temperature & Growth Hormone, Tool: Sauna Protocol 00:26:49 Peptides, Sermorelin, Secretagogues, Risk 00:29:37 Recap & Key Takeaways Disclaimer & Disclosures: https://www.hubermanlab.com/disclaimer