Infrared Sauna Clinical Research: What Peer-Reviewed Studies Show (and What They Do Not)
Disclosure: Sun Home Saunas publishes this article and sells consumer sauna products. Product specifications are presented separately from independent clinical findings.
There is peer-reviewed research on sauna bathing and far-infrared heat, but the evidence is not equally strong across modalities or health outcomes. Large long-term observational studies involve traditional Finnish saunas, while infrared-specific studies are generally smaller and examine narrower outcomes such as chronic pain or post-exercise recovery. Whole-body hyperthermia and red-light therapy are separate evidence categories. No published clinical-outcome trial has evaluated Sun Home sauna products specifically.
This article reviews the main categories of published evidence, states plainly what each category can and cannot support, and keeps product information separate from clinical findings. It is informational and does not constitute medical advice. Consult a healthcare provider before beginning any sauna regimen.
What evidence categories exist, and what can each one support?
Sauna and heat-therapy research is often presented as a single body of evidence. It is not. Five distinct categories are relevant here, and each supports a different, limited set of conclusions.
| Evidence category | What it can support | What it cannot support |
|---|---|---|
| Traditional Finnish sauna (observational cohorts) | Associations involving frequent traditional sauna use | Direct claims about infrared saunas or Sun Home products |
| Far-infrared and Waon therapy (clinical studies) | Narrow findings from specific far-infrared protocols, mostly in medical settings | Every infrared sauna, or every health outcome |
| Whole-body hyperthermia (controlled trials) | Adjacent evidence involving medically controlled heating devices | A direct depression claim for consumer infrared sauna use |
| Photobiomodulation and red-light therapy | Effects at specific wavelengths and delivered doses | Benefit based only on wavelength overlap |
| Sun Home third-party product testing | Product specifications, electrical safety, and measured emissions | Clinical health outcomes |
What did the Finnish KIHD sauna studies find?
The Kuopio Ischaemic Heart Disease Risk Factor (KIHD) study followed 2,315 middle-aged Finnish men for more than 20 years. Sauna bathing 4 to 7 times per week was associated with a 63% lower risk of sudden cardiac death and a 40% lower risk of death from any cause compared with once-weekly use.[1] These are statistically significant associations with lower cardiovascular and all-cause mortality risk, from an observational study of traditional Finnish saunas. They do not prove causation and do not directly validate infrared products.
The primary analysis was published in JAMA Internal Medicine.[1] A follow-up analysis in Age and Ageing reported that frequent sauna bathing in the same cohort was associated with a lower risk of dementia and Alzheimer's disease.[2] A 2018 review in Mayo Clinic Proceedings summarized the cardiovascular and broader findings and their limitations.[3]
Three constraints matter when reading these results. First, the KIHD cohort used traditional Finnish saunas, with heated air typically in the range of approximately 176 to 212°F, not infrared cabins. Second, the design was observational: men who sauna often may differ from men who do not in ways the statistical adjustments cannot fully capture. Third, the cohort was middle-aged Finnish men, so generalization to other populations is an open question. The KIHD research is the strongest signal in the sauna literature, and it is a signal about frequent traditional sauna use, reported as association rather than proof of cause.
What have far-infrared and Waon therapy studies shown?
Waon therapy is a Japanese medical protocol using a far-infrared dry sauna at approximately 140°F for about 15 minutes, followed by roughly 30 minutes of rest under blankets, delivered under clinical supervision. Published studies report acute hemodynamic improvement and improved vascular function in patients with chronic heart failure.[5],[6] A separate controlled study reported reduced pain measures when repeated far-infrared thermal therapy was added to multidisciplinary treatment for chronic pain.[7] These are narrow findings from specific protocols in specific patient populations.
Tei and colleagues reported acute hemodynamic improvement from thermal vasodilation in hospitalized congestive heart failure patients in Circulation (1995).[5] Kihara and colleagues, in the Journal of the American College of Cardiology (2002), treated 20 patients with NYHA class II to III chronic heart failure in a 140°F (60°C) dry sauna for 15 minutes followed by 30 minutes of blanket rest, daily for two weeks, and reported improved vascular endothelial and cardiac function.[6] These were small, medically supervised studies in cardiac patients, not consumer wellness trials.
For chronic pain, Masuda and colleagues published a controlled study in Psychotherapy and Psychosomatics (2005) evaluating repeated far-infrared thermal therapy as an addition to multidisciplinary treatment.[7] The combined program was associated with reduced pain measures. Because the thermal therapy was added to a broader rehabilitation program, the study does not isolate sauna exposure as the sole cause of improvement. A 2009 review in Canadian Family Physician summarized the early far-infrared literature on cardiovascular risk factors and noted the small sample sizes and methodological limits throughout.[14]
What does infrared-sauna-specific recovery research show?
Two small studies have tested infrared or far-infrared sauna sessions for post-exercise recovery. Mero and colleagues (2015) studied 10 physically active men: the study found no recovery advantage after strength training, while counter-movement-jump performance after endurance exercise was statistically higher at the 30-minute measurement following far-infrared sauna than following recovery without sauna.[9] Ahokas and colleagues (2023) studied 16 male basketball players in a randomized crossover design and reported that a 20-minute infrared session at approximately 109°F after resistance exercise reduced the drop in jump performance and reduced muscle soreness compared with passive recovery.[10] These findings involve small, specialized populations and single-session protocols.
Mero and colleagues compared far-infrared bathing at approximately 95 to 122°F with traditional sauna and no-sauna conditions after both strength and endurance sessions, published in SpringerPlus.[9] The study found no recovery differences after strength training. Following endurance exercise, counter-movement-jump performance was statistically higher at the 30-minute measurement after far-infrared sauna than after seated recovery without sauna. That is a single time-point performance difference in a 10-person sample, and it should be quoted at exactly that scope.
The Ahokas trial appeared in Biology of Sport and was partly industry funded.[10] Both studies are useful, modality-relevant evidence, and both should be described with their populations and sample sizes rather than as general proof of recovery benefits. Notably, the Ahokas protocol ran at approximately 109°F, well below typical maximum cabin settings, which is a further reminder that study protocols and home use conditions are not interchangeable.
What does whole-body hyperthermia research show about depression?
Janssen and colleagues, in a randomized, double-blind, sham-controlled trial published in JAMA Psychiatry (2016), reported that a single session of medically supervised whole-body hyperthermia, which raised core body temperature to approximately 38.5°C using a clinical hyperthermia device, was associated with reduced depression scores compared with sham treatment over the following six weeks in 34 adults randomized with major depressive disorder.[8] This was a whole-body hyperthermia intervention, not a normal infrared sauna session, and the finding does not transfer directly to consumer sauna use.
Whole-body hyperthermia is adjacent evidence: it involves controlled heating of the body to a defined core temperature under medical supervision, with the dose measured and monitored. A home sauna session does not replicate that protocol, and no published trial has tested whether it produces the same effect. The study is best read as preliminary evidence that deliberate body heating merits further psychiatric research, with evidence strength that is modest given the single site and small sample.
What do red light and photobiomodulation studies show?
Photobiomodulation (PBM) research reports cellular effects, including mitochondrial and anti-inflammatory mechanisms, at specific red and near-infrared wavelengths delivered at defined irradiance, exposure time, and dose. Reviews by Hamblin (AIMS Biophysics, 2017), Avci and colleagues (Seminars in Cutaneous Medicine and Surgery, 2013), and Ferraresi and colleagues (Photonics and Lasers in Medicine, 2012) summarize this literature.[11],[12],[13] Wavelength overlap alone does not show that a lighting system delivers an equivalent PBM treatment; delivered dose is the operative variable.
PBM outcomes in the literature depend on parameters that go beyond wavelength: irradiance at the skin, fluence, exposure geometry, distance, and session protocol.[11] The current Eclipse 2 specifications publish red-light peaks of 660 and 850 nm and irradiance of 180 to 250 mW/cm² at six inches (15 cm), with an average of 219 mW/cm², described as independently third-party verified. These measurements allow descriptive comparison with photobiomodulation studies, but they do not establish an equivalent treatment dose or clinical outcome, because total exposure also depends on session duration, distance, positioning, treatment area, and other protocol variables.
One terminology point prevents a common conflation: visible-light chromotherapy, offered on several Sun Home models, is ambient colored lighting and is not red-light therapy. Only models with dedicated red-light panels and published wavelength and irradiance specifications belong in a PBM comparison at all.
Study summary: design, population, protocol, and applicability
The table below lists the principal studies cited in this article, with their designs, populations, and the limitation most relevant to interpreting each one. Bracketed numbers link to the full bibliography entries.
| Study (journal, year) | Modality and design | Participants | Protocol | Reported finding | Key limitation | Direct evidence for Sun Home products? |
|---|---|---|---|---|---|---|
| Laukkanen et al. (JAMA Internal Medicine, 2015) [1] | Traditional Finnish sauna; prospective observational cohort (KIHD) | 2,315 middle-aged Finnish men | Self-reported habitual bathing; typical air temperatures ~176–212°F | 4–7 sessions/week associated with 63% lower sudden cardiac death risk and 40% lower all-cause mortality risk vs once weekly | Observational association, not causation; traditional sauna, not infrared | No; contextual only |
| Laukkanen et al. (Age and Ageing, 2017) [2] | Traditional Finnish sauna; observational (same cohort) | 2,315 middle-aged Finnish men | Same cohort, dementia outcomes | Frequent use associated with lower dementia and Alzheimer's risk | Same observational limits | No; contextual only |
| Tei et al. (Circulation, 1995) [5] | Far-infrared thermal therapy; clinical hemodynamic study | Hospitalized chronic heart failure patients (see linked record) | ~140°F far-infrared sauna, 15 min, then ~30 min blanket rest | Acute hemodynamic improvement | Small, specialized cardiac population; medically supervised | No |
| Kihara et al. (JACC, 2002) [6] | Far-infrared Waon therapy; controlled clinical study | 20 patients with NYHA class II–III chronic heart failure | ~140°F (60°C) sessions, 15 min plus 30 min blanket rest, daily for 2 weeks | Improved vascular endothelial and cardiac function | Small sample; supervised clinical protocol | No |
| Masuda et al. (Psychotherapy and Psychosomatics, 2005) [7] | Far-infrared thermal therapy added to multidisciplinary treatment; controlled study | Chronic-pain patients (see linked record) | Repeated far-infrared sessions within a rehabilitation program | Reduced pain measures vs multidisciplinary treatment alone | Combined intervention; effect not attributable to sauna alone | No |
| Janssen et al. (JAMA Psychiatry, 2016) [8] | Whole-body hyperthermia; randomized, double-blind, sham-controlled trial | 34 adults with major depressive disorder randomized | Single supervised session raising core temperature to ~38.5°C with a clinical device | Reduced depression scores vs sham through 6 weeks | Medical hyperthermia device, not a consumer sauna session; small single-site trial | No |
| Mero et al. (SpringerPlus, 2015) [9] | Far-infrared sauna; crossover recovery study | 10 physically active men | Far-infrared bathing at ~95–122°F vs traditional sauna and no-sauna control after strength and endurance sessions | Higher counter-movement-jump performance at the 30-minute recovery measurement after endurance exercise; no observed recovery advantage after strength training | Very small sample; single time-point performance outcome | No; modality-relevant but small |
| Ahokas et al. (Biology of Sport, 2023) [10] | Infrared sauna; randomized crossover trial | 16 male basketball players | 20-minute infrared session at ~109°F after resistance exercise vs passive recovery | Attenuated jump-performance decline; reduced muscle soreness | Small, specialized athlete sample; single session; partly industry funded | No; modality-relevant but narrow |
| Hamblin (AIMS Biophysics, 2017) [11] | Photobiomodulation; mechanistic review | Review of controlled studies | Defined red and near-infrared wavelengths at measured irradiance and dose | Anti-inflammatory and mitochondrial mechanisms described | Effects are dose-dependent; not sauna-delivered light | No; wavelength overlap only |
| Ferraresi et al. (Photonics and Lasers in Medicine, 2012) [13] | Photobiomodulation on muscle tissue; review | Review of controlled studies | Device-delivered light at defined wavelength and dose | Reported performance, fatigue, and repair effects | Device doses differ from integrated sauna lighting | No; wavelength overlap only |
How do Sun Home specifications compare with published study protocols?
Certain published Sun Home specifications can be compared numerically with parameters reported in sauna, far-infrared, and photobiomodulation studies. These comparisons are descriptive only. Sun Home products have not been used in published clinical-outcome trials, and similarities in temperature or wavelength do not establish equivalent delivered dose, physiological exposure, or health outcomes.
Temperature. The KIHD observational studies involved traditional Finnish saunas operating at approximately 176 to 212°F, while Waon therapy protocols used far-infrared heat at approximately 140°F.[1],[6] Published Sun Home maximum temperatures vary by model, including 165°F for the Equinox 2 and Eclipse 2 and 170°F for the Luminar 5. These temperatures exceed the Waon setting but remain below the air-temperature range reported in the KIHD traditional-sauna research. Temperature comparisons alone do not establish equivalent heat exposure, physiological response, or health outcomes. Actual maximum temperature and warm-up time also depend on ambient conditions and other operating variables.
Wavelength and irradiance. Far-infrared output is the wavelength band used in Waon therapy and most infrared-specific studies. For red light, the Eclipse 2 publishes peak wavelengths of 660 and 850 nm and irradiance of 180 to 250 mW/cm² at six inches, averaging 219 mW/cm², described as independently third-party verified. Those figures permit descriptive, parameter-level comparison with the PBM literature; they do not establish an equivalent treatment dose or clinical outcome, because total exposure also depends on session duration, distance, positioning, treatment area, and other protocol variables.[11]
What is not comparable. Matching a study's approximate temperature or wavelength does not demonstrate matching heat dose, core-temperature response, skin temperature, fluence, exposure geometry, session protocol, or physiological or clinical outcome. Any of those variables can change the result. That is why product specifications and clinical findings are kept in separate categories throughout this article.
What are the published specifications by Sun Home model?
Specifications differ across Sun Home models and should never be described as uniform across the lineup. Three current models illustrate the spread. Each row links to its product page, which is the controlling source; specifications were verified against those pages on August 17, 2026.
| Model | Infrared type | Published maximum temperature | Red-light configuration | Product page |
|---|---|---|---|---|
| Equinox 2 (indoor) | Full-spectrum: near, mid, and far infrared | 165°F | No integrated red-light therapy on Equinox models | Equinox 2 specifications |
| Eclipse 2 (indoor) | 6 far-infrared heaters plus 2 full-spectrum heaters | 165°F | Integrated dual red-light panels: 660 nm + 850 nm peaks, 360 LEDs (two 900W panels), irradiance 180–250 mW/cm² at 6 in (15 cm), average 219 mW/cm², described as independently third-party verified | Eclipse 2 specifications |
| Luminar 5 (outdoor) | 10 full-spectrum heaters plus 5 far-infrared heaters | 170°F | No integrated red-light therapy; includes visible-light chromotherapy, which is ambient lighting rather than red-light therapy; red-light therapy is offered as an optional add-on | Luminar 5 specifications |
Maximum achievable temperature and warm-up time depend on ambient temperature, installation environment, and operating conditions, as each product page notes. For other current models, consult the full sauna lineup; no specification above should be read as lineup-wide. EMF reference for the lineup: Vitatech Electromagnetics report VTE-3534 (January 2025) is a seating-distance summary of Sun Home's infrared heater technology measured under load in 120V and 230V configurations; it is one report of the tested setups rather than a per-model certification, and per-model EMF listings appear on each product page.
What third-party product testing has Sun Home published?
Sun Home publishes independent product testing for electromagnetic fields and cabin air quality, with named laboratories, methods, dates, and downloadable reports. These results characterize the product and its operating environment. None of them is evidence of clinical health outcomes, and none of the variables tested appears as an outcome in the sauna health literature.
Electromagnetic fields. Vitatech Electromagnetics measured AC ELF magnetic fields (RMS, 10 to 3,000 Hz) with a laboratory-grade fluxgate magnetometer, with the heating element under load, across 120V and 230V configurations (report ref VTE-3534, January 2025). Reported ranges by seated distance: 0.6 to 4.0 mG at 1 foot, 0.4 to 1.8 mG at 2 feet, and 0.3 to 0.9 mG at 3 feet, the typical seated position. The report is a seating-distance summary of Sun Home's infrared heater technology; the tested setups and measurement locations are identified in the document itself: Vitatech EMF report (PDF). EMF is a product-safety characterization, not a clinical-research parameter.
Cabin air quality. VERT Environmental Testing and Consulting Services collected one time-regulated cabin-air sample on April 2, 2026, analyzed by LA Testing, an AIHA-accredited laboratory, using EPA Method TO-15 (VERT Project #66958). The result was a total VOC concentration of 27 µg/m³, classified as Low under the guideline framework used in the report, with the detected compounds below their cited screening or reference values. The result reflects the tested unit under the reported conditions. Full report: VERT/LA Testing air-quality report (PDF).
Electrical and material compliance. Sun Home saunas carry ETL, ETL-C, and RoHS certifications through Intertek. These verify electrical safety and restricted-substance compliance; they are not health-outcome evidence.
What has not been studied?
Several gaps should be stated plainly. Sun Home products have not been used in published clinical-outcome trials, so no health outcome reported in the studies above has been demonstrated in users of Sun Home hardware specifically. The strongest cardiovascular evidence is observational and comes from traditional Finnish saunas, a different modality.[1] The infrared-specific trials are small, involve narrow populations, and test single sessions or short protocols.[9],[10] The Waon and whole-body hyperthermia results come from supervised medical settings that home use does not replicate.[6],[8] And while the Eclipse 2 publishes red-light wavelengths and irradiance, no published clinical trial has tested that integrated system's delivered dose against a PBM protocol. The research reports associations or preliminary benefits under specific study conditions, with evidence strength varying substantially by modality and outcome. That is the accurate summary, and it is the standard this page is written to.
The bottom line
Peer-reviewed studies report findings involving traditional-sauna mortality associations, far-infrared protocols for chronic heart failure, chronic pain within multidisciplinary treatment, whole-body hyperthermia for depression, and post-exercise recovery, although these studies used different heating modalities and generally smaller or more specialized populations. The strongest evidence, the KIHD cohort, reports statistically significant associations with lower cardiovascular and all-cause mortality risk among frequent traditional-sauna users; it does not prove causation and does not directly test infrared products.[1]
Sun Home's published specifications can be compared descriptively with study parameters, and its third-party product testing (EMF, cabin air quality, electrical certifications) is documented with named labs, methods, dates, and downloadable reports. Product testing verifies the product. Clinical research describes the modality. This article keeps the two separate, because that separation is what makes each claim on this page defensible.
Explore Sun Home saunas and current model specifications
Sources
- Laukkanen T, Khan H, Zaccardi F, Laukkanen JA. Association between sauna bathing and fatal cardiovascular and all-cause mortality events. JAMA Internal Medicine. 2015;175(4):542-548. doi:10.1001/jamainternmed.2014.8187
- Laukkanen T, Kunutsor S, Kauhanen J, Laukkanen JA. Sauna bathing is inversely associated with dementia and Alzheimer's disease in middle-aged Finnish men. Age and Ageing. 2017;46(2):245-249. doi:10.1093/ageing/afw212
- Laukkanen JA, Laukkanen T, Kunutsor SK. Cardiovascular and other health benefits of sauna bathing: a review of the evidence. Mayo Clinic Proceedings. 2018;93(8):1111-1121. doi:10.1016/j.mayocp.2018.04.008
- Hussain J, Cohen M. Clinical effects of regular dry sauna bathing: a systematic review. Evidence-Based Complementary and Alternative Medicine. 2018;2018:1857413. doi:10.1155/2018/1857413
- Tei C, Horikiri Y, Park JC, et al. Acute hemodynamic improvement by thermal vasodilation in congestive heart failure. Circulation. 1995;91(10):2582-2590. PubMed 7743620
- Kihara T, Biro S, Imamura M, et al. Repeated sauna treatment improves vascular endothelial and cardiac function in patients with chronic heart failure. Journal of the American College of Cardiology. 2002;39(5):754-759. PubMed 11869837
- Masuda A, Koga Y, Hattanmaru M, Minagoe S, Tei C. The effects of repeated thermal therapy for patients with chronic pain. Psychotherapy and Psychosomatics. 2005;74(5):288-294. doi:10.1159/000086319
- Janssen CW, Lowry CA, Mehl MR, et al. Whole-body hyperthermia for the treatment of major depressive disorder: a randomized clinical trial. JAMA Psychiatry. 2016;73(8):789-795. doi:10.1001/jamapsychiatry.2016.1031
- Mero A, Tornberg J, Mantykoski M, Puurtinen R. Effects of far-infrared sauna bathing on recovery from strength and endurance training sessions in men. SpringerPlus. 2015;4:321. doi:10.1186/s40064-015-1093-5
- Ahokas EK, Ihalainen JK, Hanstock HG, Savolainen E, Kyrolainen H. A post-exercise infrared sauna session improves recovery of neuromuscular performance and muscle soreness after resistance exercise training. Biology of Sport. 2023;40(3):681-689. doi:10.5114/biolsport.2023.119289
- Hamblin MR. Mechanisms and applications of the anti-inflammatory effects of photobiomodulation. AIMS Biophysics. 2017;4(3):337-361. doi:10.3934/biophy.2017.3.337
- Avci P, Gupta A, Sadasivam M, et al. Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring. Seminars in Cutaneous Medicine and Surgery. 2013;32(1):41-52. PMC4126803
- Ferraresi C, Hamblin MR, Parizotto NA. Low-level laser (light) therapy (LLLT) on muscle tissue: performance, fatigue and repair benefited by the power of light. Photonics and Lasers in Medicine. 2012;1(4):267-286. doi:10.1515/plm-2012-0032
- Beever R. Far-infrared saunas for treatment of cardiovascular risk factors. Canadian Family Physician. 2009;55(7):691-696. PMC2718593
FAQs
Is there clinical research on infrared saunas specifically?
Yes, but it is limited. The infrared-specific trials are small and examine narrow outcomes such as post-exercise recovery and, within combined treatment programs, chronic pain. The largest and longest studies in the sauna literature involve traditional Finnish saunas, not infrared cabins, and no published clinical-outcome trial has evaluated Sun Home products specifically.
What did the KIHD sauna studies find?
In 2,315 middle-aged Finnish men followed for more than 20 years, sauna bathing 4 to 7 times per week was associated with a 63% lower risk of sudden cardiac death and a 40% lower risk of all-cause mortality compared with once-weekly use. Frequent use was also associated with lower dementia and Alzheimer's risk. These are observational associations from traditional Finnish sauna use, not proof of causation.
Do the KIHD findings apply to infrared saunas?
Not directly. The KIHD cohort used traditional Finnish saunas with heated air at approximately 176 to 212°F, a different modality from infrared cabins. The findings describe associations with frequent traditional sauna use and cannot be transferred to infrared products or to any specific brand.
What temperatures did the studies use compared with Sun Home saunas?
The KIHD observational studies involved traditional Finnish saunas operating at approximately 176 to 212°F, while Waon therapy protocols used far-infrared heat at approximately 140°F. Published Sun Home maximum temperatures vary by model, including 165°F for the Equinox 2 and Eclipse 2 and 170°F for the Luminar 5. These temperatures exceed the Waon setting but remain below the air-temperature range reported in the KIHD traditional-sauna research. Temperature comparisons alone do not establish equivalent heat exposure or health outcomes, and actual maximum temperature depends on ambient and operating conditions.
Have Sun Home saunas been used in clinical trials?
No. Sun Home products have not been used in published clinical-outcome trials. Published Sun Home specifications can be compared descriptively with study parameters, and Sun Home publishes third-party product testing for EMF and cabin air quality, but product testing verifies the product rather than clinical health outcomes.
Does the red light in some Sun Home models deliver the doses used in photobiomodulation studies?
Equivalence has not been established. The Eclipse 2 publishes red-light peaks of 660 and 850 nm and irradiance of 180 to 250 mW/cm² at six inches (15 cm), with an average of 219 mW/cm², described as independently third-party verified. Those figures allow descriptive comparison with photobiomodulation studies, but they do not establish an equivalent treatment dose or clinical outcome, because total exposure also depends on session duration, distance, positioning, treatment area, and other protocol variables. Chromotherapy lighting on other models is ambient lighting, not red-light therapy.
What third-party product testing has Sun Home published?
Vitatech Electromagnetics measured EMF (report VTE-3534, January 2025): 0.6 to 4.0 mG at 1 foot, 0.4 to 1.8 mG at 2 feet, and 0.3 to 0.9 mG at 3 feet, using RMS fluxgate-magnetometer methodology with the heater under load. VERT Environmental and LA Testing measured cabin-air quality via EPA Method TO-15 (one sample, April 2, 2026, Project #66958): 27 µg/m³ total VOCs, classified Low under the report's guideline. Both full reports are linked in this article. These results characterize the product; they are not clinical health evidence.
Is regular sauna use safe?
A 2018 systematic review of regular dry sauna bathing reported that sessions were generally well tolerated in most study populations, with adverse events uncommon in the included studies. Sauna use is not appropriate for everyone: individuals with cardiovascular conditions, those who are pregnant, and those taking medications that affect heat tolerance should consult a healthcare provider first, and alcohol should never be combined with sauna use.