Huberman Lab

How to Control Your Metabolism by Thyroid & Growth Hormone | Huberman Lab Essentials

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

AHAndrew Hubermanhost

Mar 6, 2025·31m·Watch on YouTube ↗

📖 CHAPTERS

1. 1
   0:00 – 2:20

   Introduction: Metabolism, Thyroid, and Growth Hormone Overview

   Huberman frames the episode as a focused review of thyroid and growth hormone as the two primary systems governing metabolism. He defines metabolism broadly as energy use for growth, repair, and maintenance, and emphasizes that these hormones affect not just body fat and muscle but also brain function and long-term health.

2. 2
   2:20 – 4:20

   Hormone Pathways: Hypothalamus, Pituitary, and the Thyroid Axis

   He explains the basic neuroendocrine architecture: hypothalamic releasing hormones control pituitary stimulating hormones, which then act on glands like the thyroid. The thyroid gland’s structure and its hormones T4 and T3 are introduced, with emphasis on T3 as the active driver of metabolism.

3. 3
   4:20 – 5:00

   What Thyroid Hormone Does for Metabolism and Body Composition

   Huberman details T3’s actions across tissues, from muscle and liver to bone and adipose tissue. He explains how thyroid hormone mobilizes fats, processes sugars, supports ATP production, and why higher thyroid activity is associated with leanness.

4. 4
   5:00 – 8:45

   Nutritional Foundations for Healthy Thyroid Function

   He outlines the critical nutrients required for thyroid hormone production—iodine, L‑tyrosine, and selenium—and where they come from in the diet. Huberman points out that while iodine intake is usually adequate, selenium is commonly insufficient, especially in those who don’t eat animal products or Brazil nuts.

5. 5
   8:45 – 14:00

   Thyroid, Glucose Handling, Bone Density, and Brain Energy

   Huberman connects thyroid function to glucose regulation, bone health, and brain energy use. Adequate thyroid hormone enhances glucose uptake into tissues like muscle and bone, supports faster recovery from injuries, and helps the brain efficiently utilize glucose or ketones.

6. 6
   14:00 – 18:40

   Growth Hormone Basics and Age-Related Decline

   He introduces growth hormone, which follows a similar releasing-hormone/stimulating-hormone logic as thyroid. Growth hormone drives growth, repair, and fat mobilization, but declines with age, leading many to pursue growth hormone replacement despite serious risks when levels get too high.

7. 7
   18:40 – 21:40

   Sleep, Delta Waves, and Nighttime Growth Hormone Release

   Huberman explains that the largest natural pulses of growth hormone occur early in the night during slow-wave (delta) sleep. He emphasizes the need for both deep sleep and low nocturnal blood glucose to maximize this release and explores how brain wave states gate growth hormone output.

8. 8
   21:40 – 23:55

   Meditation, Altered Traits, and Brain States Resembling Deep Sleep

   Drawing from the book ‘Altered Traits,’ Huberman discusses how certain meditation practices can shift brain activity into patterns similar to slow-wave sleep. Although the evidence is still emerging, he suggests that such states might facilitate growth hormone release by mimicking the brain conditions that normally trigger it.

9. 9
   23:55 – 28:25

   Exercise Protocols to Boost Growth Hormone 300–500%

   He synthesizes a large exercise literature showing that specific combinations of duration, intensity, warm-up, and temperature management can dramatically elevate growth hormone. Both resistance and endurance training can be effective if blood glucose is kept relatively low and sessions are not excessively long.

10. 10
    28:25 – 33:00

    Arginine Supplementation: Potent but Limited Growth Hormone Tool

    Huberman reviews evidence that high-dose arginine can markedly increase growth hormone, but with diminishing returns and gastrointestinal side effects at higher doses. He also notes that combining arginine with exercise does not stack effects; the total increase remains within the same 300–500% range.

11. 11
    33:00 – 37:50

    Deliberate Hyperthermia and Sauna: Massive Growth Hormone Surges

    He describes studies showing that carefully structured sauna use can drive extraordinarily large increases in growth hormone, up to 16-fold, likely due to hypothalamic neurons sensitive to both heat and hormone release. While the effects are impressive, he repeatedly warns about the real danger of overheating.

12. 12
    37:50 – 41:25

    Peptides and Growth Hormone Secretagogues: Mechanisms and Risks

    Huberman explains what peptides are and how synthetic versions can mimic or stimulate growth hormone pathways, such as sermorelin acting like growth hormone–releasing hormone. He acknowledges their effectiveness but flags the potential for altered gene expression and tumor growth with chronic use.

13. 13
    41:25

    Conclusion: Integrating Thyroid and Growth Hormone Tools for Metabolic Health

    Huberman recaps the roles of thyroid and growth hormone in determining how many nutrients we can use, how effectively we repair tissues, and how our brain functions. He encourages leveraging behavioral and nutritional tools—sleep, diet, exercise, and safe heat exposure—before turning to drugs, and reminds listeners of the bidirectional communication between brain and hormones.