Using Cortisol & Adrenaline to Boost Our Energy & Immune System Function

April 21, 2026

AI Summary

5 min read

In a 2014 study published in the Proceedings of the National Academy of Sciences, researchers injected human subjects with E. coli and then had them perform a specific breathing protocol — the kind of cyclic hyperventilation popularized by Wim Hof. The result was striking: the fever, vomiting, and other negative effects of the infection were greatly attenuated. Inflammatory cytokines like IL-6 dropped; anti-inflammatory cytokines like IL-10 rose. The mechanism was not mysterious. The breathing had triggered a surge of adrenaline, and that surge had, in turn, activated the immune system on demand.

This episode of the Huberman Lab podcast is built around a single, counterintuitive argument: cortisol and adrenaline are not your enemies. They are the body's primary tools for energy and immune defense. The problem is not their presence but their timing and duration. Andrew Huberman, a professor of neurobiology at Stanford, spends the episode explaining how to deliberately turn these hormones on and off — and why doing so can transform your energy, your learning, and your resistance to infection.

The Morning Cortisol Pulse Is Non-Negotiable

Continue reading the full summary in the app — free to try.

Read Full Summary →

Free • No credit card required

Listen to Audio Summary Open in App

Never miss an episode of Huberman Lab

Get every new episode summarized in your inbox — free, ~5 minutes to read.

No spam. Unsubscribe anytime.

What you'll learn

1 Timestamped Outline
2 (01:46) **Episode Introduction & Hormone Series Context** - Andrew Huberman frames today's topic: cortisol and epinephrine (adrenaline) as the fifth installment in the hormone series, focused on energy and immune function
3 (10:10) **Three Quick Previews: Intermittent Fasting, Stomach Grumbling, and Growth Hormone** - Huberman addresses three topics promised from previous episodes before diving into cortisol and adrenaline
4 (17:25) **Cortisol & Epinephrine: The Energy and Immune Hormones** - Introduces the core thesis that these hormones dominate energy levels and immune function, reframing them as beneficial when properly regulated
5 (24:13) **Tool #1: Morning Sunlight to Time Cortisol Release** - The foundational practice for healthy cortisol patterns: viewing sunlight within 30-60 minutes of waking
6 (31:56) **Stress Blips vs. Chronic Elevation: The Key Distinction** - Life stressors cause brief cortisol and epinephrine spikes that are healthy; chronic elevation is the problem
7 (36:29) **Deliberate Stress Protocols: Ice Baths, Breathing, and HIIT** - All stressors are biologically equivalent—the key is using them deliberately to build resilience and energy

+ Full timestamped outline available in the app

Guests on this episode

Andrew Huberman

Show Notes

Using Cortisol & Adrenaline to Boost Our Energy & Immune System Function