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Andrew Huberman
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According to Dr. Andrew Huberman, deliberate cold exposure triggers a significant and sustained release of dopamine and norepinephrine. A cold plunge at 50°F for 1–3 minutes can increase dopamine levels by 250% above baseline, lasting for several hours. He recommends ending showers cold rather than warm to maximize the catecholamine response.

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Using Deliberate Cold Exposure for Health and Performance
Andrew Huberman|28:23

...deliberate cold exposure causes a 250% increase in dopamine that lasts for hours...

How to Optimize Your Water Quality & Intake for Health
Andrew Huberman|3:48

...end your shower cold, not warm. The catecholamine response is what gives you that lasting energy...

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