Sauna
Top podcast episodes on sauna use. Finnish sauna, infrared, and heat exposure for cardiovascular health, longevity, and recovery. Featuring FoundMyFitness, Huberman Lab, and more.
Heat exposure via Finnish or infrared sauna for cardiovascular health, recovery, longevity, and brain protection
Sauna has the strongest longevity evidence of any lifestyle intervention outside of exercise. The Finnish data is striking: Laukkanen 2015 followed 2,315 men for 20 years and found 4-7 sauna sessions per week associated with 40% lower all-cause mortality and 50% lower cardiovascular mortality compared to once weekly. Laukkanen 2017 found 65% lower dementia risk in frequent users. These are observational studies, not RCTs, but the effect sizes are large and dose-dependent.
Where the evidence is strong: cardiovascular health (blood pressure, arterial compliance, cardiac output), all-cause mortality reduction, dementia risk reduction, recovery from exercise, pain relief.
Where the evidence is moderate: inflammation reduction (Kunutsor 2019 showed lower CRP), growth hormone release (acute, transient), mood and sleep improvement, skin health.
Where the evidence is weaker: weight loss (you lose water weight, not fat), "detoxification" through sweating (some heavy metal excretion, but kidneys and liver do the real work), immune function claims.
The healthy user problem: The biggest caveat with the Finnish data is confounding. People who sauna 4-7 times per week are likely healthier in other ways too. That said, Li 2021 meta-analysis of 16 interventional studies (not just observational) confirmed acute blood pressure reductions of 5-6 mmHg and improved ejection fraction over 2-4 weeks. The cardiovascular mechanisms are real.
The practical bottom line: If you have access to a sauna, you should be using it. The risk/benefit ratio is among the best of any intervention. The cardiovascular adaptations mimic moderate exercise. The cost is often $0 (gym membership). And unlike most longevity interventions, this one people actually enjoy doing.
Science & Mechanisms
The Numbers That Matter
| Metric | Value | Source |
|---|---|---|
| All-cause mortality reduction | 40% (4-7x/week vs 1x/week, 20-year follow-up) | Laukkanen 2015 |
| Cardiovascular mortality reduction | 50% (4-7x/week vs 1x/week) | Laukkanen 2015 |
| Dementia risk reduction | 65% (4-7x/week vs 1x/week) | Laukkanen 2017 |
| Stroke risk reduction | 61% (4-7x/week vs 1x/week) | Kunutsor 2019 |
| Hypertension risk reduction | 47% (4-7x/week vs 1x/week) | Zaccardi 2018 |
| Acute blood pressure drop | 5-6 mmHg systolic | Li 2021 |
| Heart rate during session | 100-150 bpm (mimics moderate exercise) | Laukkanen 2019 Review |
| Growth hormone release | 200-300% increase (acute, transient) | Hussain 2018 |
Mechanisms
1. Cardiovascular conditioning. The core mechanism. Heat stress increases heart rate to 100-150 bpm, raises cardiac output, and dilates blood vessels. Over weeks and months, this trains the cardiovascular system similarly to moderate aerobic exercise. Li 2021 meta-analysis of 16 interventional studies confirmed acute blood pressure reductions of 5-6 mmHg and improved ejection fraction over 2-4 weeks.
2. Heat shock proteins (HSPs). HSP70 and HSP90 are chaperone proteins activated by heat stress. They repair misfolded proteins, protect cells from damage, and reduce oxidative stress. This is the molecular basis for sauna's protective effects on the brain and heart. HSP activation requires sustained core temperature elevation — which is why session length and temperature matter.
3. BDNF and neuroprotection. Heat stress increases brain-derived neurotrophic factor, the growth factor most associated with learning, memory, and neuroplasticity. This likely explains the Laukkanen 2017 finding of 65% lower dementia risk. BDNF also has antidepressant effects, which tracks with the mood benefits sauna users report.
4. Inflammation reduction. Kunutsor 2019 showed Finnish men using sauna 4-7 times weekly had significantly lower C-reactive protein (CRP) at baseline and after 11 years of follow-up. The anti-inflammatory effect is chronic and cumulative, not acute.
5. Autonomic nervous system training. Heat stress activates the sympathetic nervous system (heart rate up, sweating) followed by a parasympathetic rebound (relaxation, HRV improvement). Over time, this training effect improves vagal tone and autonomic flexibility, which is why sauna improves sleep and reduces anxiety.
6. Growth hormone. Sauna transiently increases growth hormone (200-300% above baseline). This sounds impressive but the spike is short-lived and the practical significance for muscle growth is debated. It's real, it's measurable, but don't count on sauna as a growth hormone replacement.
What the Evidence Actually Says
Cardiovascular health: The strongest evidence. Three Laukkanen papers (2015, 2017, 2019) plus Zaccardi 2018 and Kunutsor 2019 stroke study paint a consistent picture: frequent sauna use (4-7x/week) is associated with 40-65% reductions in cardiovascular mortality, stroke, hypertension, and dementia. Li 2021 adds interventional data: 16 studies showing acute BP reduction and improved cardiac function.
Recovery: Mero 2015 showed post-exercise infrared sauna enhanced neuromuscular recovery. Unlike cold exposure, heat doesn't blunt any training adaptation. Sauna is safe post-lifting, post-running, post-anything.
Chronic pain: Masuda 2005 found far-infrared thermal therapy significantly improved pain, sleep quality, and mood in fibromyalgia patients. This is a smaller study but consistent with the broader heat-as-medicine literature.
Lifestyle synergy: Kunutsor 2023 reviewed the combination of sauna with exercise and found additive benefits. The combination of good cardiorespiratory fitness + regular sauna use had better outcomes than either alone.
The confounding question: All the landmark Laukkanen studies are observational. People who sauna 4-7 times per week in Finland are likely healthier in many other ways. But the dose-response relationship (more sessions = more benefit, in a linear fashion), the plausible mechanisms, and the interventional meta-analysis data collectively make a strong case that the effect is causal, not just correlation.
Episodes
A HouseCall episode covering optimal sauna session duration, managing estrogen imbalance and PMS symptoms, understanding detox reactions, and other listener health questions.
Sauna works like aerobic exercise for your cardiovascular system, with regular use linked to reduced heart disease and all-cause mortality. Learn the specific temperatures, dura...
A curated Q&A compilation covering the science of sauna use. Rhonda Patrick reviews evidence supporting sauna for health benefits, explains how Finnish humid saunas may reduce v...
Dr. Rhonda Patrick shares protocols for fasting, reducing dementia risk, and reversing heart aging. Discusses optimal sauna use for longevity (hotter is not always better) and s...
Rhonda Patrick explores how sauna use mimics many of the benefits of exercise. Covers the cardiovascular, metabolic, and longevity benefits of heat exposure and optimal sauna protocols.
Dr. Jari Laukkanen presents research on sauna use for cardiovascular health and mortality reduction from the Finnish Kuopio study.
Ben Greenfield compares dry sauna versus infrared sauna versus hot tub. Also covers gut health healing strategies and other biohacking approaches.
Sauna or a hot bath 1-2 hours before bed can dramatically increase slow-wave sleep and growth hormone secretion. The protocol: 20 minutes at 176F (sauna) or 104F (bath), timed t...
End on cold to force your body to reheat itself, maximizing metabolic benefit - this is the Soberg Principle. Minimum effective dose: 11 minutes cold and 57 minutes heat per wee...
People with depression have elevated nighttime body temperatures and impaired cooling, and fixing this correlates with symptom reduction. Whole-body hyperthermia raising core te...
Dr Rhonda Patrick sits down with Chris Williamson for a wide-ranging conversation on the daily habits that actually move the needle for health and longevity. Patrick dives deep ...
Dr. Charles Raison explores the connection between depression and the immune system, discussing how inflammation affects mood and the brain-body connection in mental health.
Dr. David Jockers interviews Connie Zack from Sunlighten about how infrared sauna therapy can reduce inflammation and support detoxification. They cover the differences between ...
Dr. Alex Arguello and co-host Paige discuss the health benefits of infrared saunas as part of their ongoing detox conversation. They explain how infrared saunas differ from trad...
Host Laura Powers interviews Alicia Botyrus, Director of Business Development Global for Sunlighten, about the health benefits of infrared saunas. They cover the fundamentals of...
Dr. Joseph Mercola interviews Brian Richards, founder of Sauna Space, about near-infrared sauna therapy and its advantages over far-infrared and traditional Finnish saunas. They...
Mike Matthews takes a skeptical, evidence-based look at infrared sauna claims by reviewing 23 scientific studies. He explains how infrared saunas use infrared light to heat the ...
Dr. Mercola and physician Jenna Greenfield (formerly a pediatric ER doctor, now with High Tech Health) have an in-depth conversation about sauna use for health optimization. Mer...
Brian Richards, founder of SaunaSpace, joins host Cliff Dunning to discuss the science and personal story behind combining sauna heat therapy with near-infrared light therapy. R...
The host summarizes key findings from the landmark Finnish sauna study of 2,300+ middle-aged men, drawing heavily on Dr. Rhonda Patrick's breakdowns of the research. The episode...
Host Elizabeth Benton explains the differences between red light therapy, near-infrared light, and infrared saunas, breaking down how each works and why she uses both a red ligh...
Katie from Wellness Mama delivers a concise solo episode covering sauna types, benefits, and practical protocols. She traces the history of infrared saunas back to Dr. John Harv...
Dr. Sydnee McElroy and husband Justin explore the long history of saunas across cultures, from Bronze Age sweat houses and Finnish folk medicine to Native American sweat lodges ...
Brock Armstrong narrates Ben Greenfield's detailed blog post on how to biohack an infrared sauna for greater heat output, improved detoxification, and enhanced fitness benefits....
Ben Greenfield interviews Raleigh Duncan and Andy Pace from Clearlight Saunas about the science and practical use of infrared saunas. The conversation covers the key differences...
Hosts Norman Swan and Tegan Taylor from Australia's ABC network examine the evidence behind sauna health claims with a healthy dose of skepticism. Norman shares his firsthand ex...
Writer and cold water swimmer Emma O'Kelly joins Liz Earle to discuss her book on sauna culture, drawing from 10,000 kilometers of travel through Finland, Estonia, Norway, and o...
Katie from Wellness Mama interviews the two co-founders of HigherDOSE, Katie Kaps and Lauren Berlingeri, about at-home infrared sauna blankets, PEMF mats, and red light therapy ...
Josh and Chuck from Stuff You Should Know tackle the hot-cold plunge trend in this short episode. They trace the practice back to Finnish sauna culture and explore the concept o...
Andrew Huberman breaks down the neuroscience of how your body senses and responds to heat, from the skin-to-brain circuit that regulates temperature to the key role of the preop...