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Sauna Hype

The claim

“Sauna gives you clearer, younger-looking skin.”

Hot air. No study has tested sauna against acne or wrinkles. One small study linked regular sauna use to a steadier skin barrier, and heat is a recognized trigger for rosacea flushing.

Updated Sep 24, 2026 · 1 study reviewed

Nothing solid supports it, or the evidence points the other way.

People say it in places like these

  • Sauna blanket sellers

    Sweating under an infrared blanket promotes glowing skin.

  • Infrared sauna brands

    Infrared heat stimulates collagen production.

  • Infrared sauna sellers

    Near-infrared light raised human cell growth by 155–171%.

The research found this

Nobody has tested whether sauna use improves collagen, wrinkles, elasticity or acne. A 2023 dermatology letter found no studies of infrared sauna skin benefits or safety, and it counted 23 non-medical web sources that promised clearer skin or less acne.Source 1 · ReviewPopularity of infrared saunas and potential dermatologic risks: A Google Trends analysisPan S, Gallo Marin B, Ragi SD, et al.. Clinics in Dermatology, 2023.Read the paper ↗PubMed ↗

The one skin-physiology study compared 41 healthy adults aged 20 to 49 with and without regular sauna exposure. The regular-sauna group had a more stable barrier, more water in the outer skin layer, faster recovery after two 15-minute rounds at 80°C and less oil on the forehead.Source 2 · Clinical trialEffect of Regular Sauna on Epidermal Barrier Function and Stratum Corneum Water-Holding Capacity in vivo in Humans: A Controlled StudyKowatzki D, Macholdt C, Krull K, et al.. Dermatology, 2008.Read the paper ↗PubMed ↗ The authors called the study exploratory, and the abstract doesn't give group sizes or say whether people were assigned to sauna.

Heat can make some skin worse. Sauna heat lands on the skin first, and mean skin temperature rose 8.3°C in a traditional sauna and 6.1°C in an infrared cabin in one study.Source 3 · Crossover trialComparison of thermoregulatory, cardiovascular, and immune responses to different passive heat therapy modalitiesAtencio JK, Reed EL, Wiedenfeld Needham K, et al.. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 2025.Read the paper ↗PubMed ↗ In a National Rosacea Society survey of 1,066 patients, 75% named hot weather and 51% named hot baths as triggers, and the society lists saunas among temperature triggers.Source 4 · DatasetRosacea Triggers SurveyNational Rosacea Society. National Rosacea Society, 2026.Read the paper ↗Source 5 · GuidanceFactors That May Trigger Rosacea Flare-UpsNational Rosacea Society. National Rosacea Society, 2026.Read the paper ↗ A Turkish case-control study found a regular heat-bathing habit in 35% of 100 rosacea patients and 19% of 100 controls.Source 6 · Cross-sectional studyInvestigation of skincare habits and possible rosacea triggers of patients with rosacea: A prospective case–control studyGuder H. Northern Clinics of Istanbul, 2024.Read the paper ↗PubMed ↗

Lab work on infrared light and heat points toward aging. Near-infrared (IR-A) light raised the collagen-degrading enzyme MMP-1 in the dermis of 80% of volunteers, and repeated infrared exposure three times a week for four weeks lowered type I procollagen and raised MMP-1 in buttock skin.Source 7 · Clinical trialInfrared Radiation-Induced Matrix Metalloproteinase in Human Skin: Implications for ProtectionSchroeder P, Lademann J, Darvin ME, et al.. Journal of Investigative Dermatology, 2008.Read the paper ↗PubMed ↗Source 8 · Clinical trialRegulation of type I procollagen and MMP-1 expression after single or repeated exposure to infrared radiation in human skinKim MS, Kim YK, Cho KH, et al.. Mechanisms of Ageing and Development, 2006.Read the paper ↗PubMed ↗ A later review puts the IR-A study's lamp at 105 mW/cm², and average daytime solar IR-A runs around 20 mW/cm².Source 9 · ReviewInfrared and skin: Friend or foeBarolet D, Christiaens F, Hamblin MR. Journal of Photochemistry and Photobiology B: Biology, 2016.Read the paper ↗PubMed ↗ In a study of 1,001 people with melasma, longer exposure to cooking fires or workplace heat went with more severe melasma.Source 10 · Cross-sectional studyClinical and epidemiologic features of melasma: a multicentric cross‐sectional study from IndiaSarkar R, Jagadeesan S, Basavapura Madegowda S, et al.. International Journal of Dermatology, 2019.Read the paper ↗PubMed ↗

Heat held against the same patch of skin for months carries its own risk. Repeated heat below the burn threshold can cause a lasting rash called erythema ab igne, and it most often comes from heat used for chronic pain.Source 11 · ReviewErythema Ab Igne: A Clinical ReviewHarview CL. Cutis, 2023.Read the paper ↗PubMed ↗ Case reports tie it to laptops, heating pads, space heaters and electric blankets, and one letter describes it after a heated slimming "sauna belt".Source 12 · Case reportLaptop Computer–Induced Erythema ab Igne in a Child and Review of the LiteratureArnold AW, Itin PH. Pediatrics, 2010.Read the paper ↗PubMed ↗Source 13 · Case reportErythema ab igne following Sauna belt use for abdominal obesity and celluliteRadmanesh M. International Journal of Dermatology, 2009.Read the paper ↗PubMed ↗ We found no published case from an infrared sauna blanket or cabin.

The dial reads 83°H for four reasons

How the reading adds up

22 + 18 + 25 + 18 = 83°H

  1. EvidenceWhat kind of evidence exists in people?

    22/25

    Our PubMed search for sauna studies on collagen, wrinkles, elasticity or acne found none, and a 2023 dermatology letter found no study of infrared sauna skin benefits.Source 1 · ReviewPopularity of infrared saunas and potential dermatologic risks: A Google Trends analysisPan S, Gallo Marin B, Ragi SD, et al.. Clinics in Dermatology, 2023.Read the paper ↗PubMed ↗ The one skin-physiology study measured barrier function in 41 adults.Source 2 · Clinical trialEffect of Regular Sauna on Epidermal Barrier Function and Stratum Corneum Water-Holding Capacity in vivo in Humans: A Controlled StudyKowatzki D, Macholdt C, Krull K, et al.. Dermatology, 2008.Read the paper ↗PubMed ↗

  2. ConsistencyHas the finding held up?

    18/25

    That study compared a group with regular sauna exposure against a group without, and its design details sit behind a paywall.Source 2 · Clinical trialEffect of Regular Sauna on Epidermal Barrier Function and Stratum Corneum Water-Holding Capacity in vivo in Humans: A Controlled StudyKowatzki D, Macholdt C, Krull K, et al.. Dermatology, 2008.Read the paper ↗PubMed ↗ Experiments with infrared light and heat push skin in the aging direction.Source 7 · Clinical trialInfrared Radiation-Induced Matrix Metalloproteinase in Human Skin: Implications for ProtectionSchroeder P, Lademann J, Darvin ME, et al.. Journal of Investigative Dermatology, 2008.Read the paper ↗PubMed ↗Source 8 · Clinical trialRegulation of type I procollagen and MMP-1 expression after single or repeated exposure to infrared radiation in human skinKim MS, Kim YK, Cho KH, et al.. Mechanisms of Ageing and Development, 2006.Read the paper ↗PubMed ↗

  3. MagnitudeDoes the claim match the size of the effect?

    25/25

    "Younger-looking" describes an effect nobody has measured in sauna users. The barrier study measured a more stable barrier, higher surface hydration, faster recovery after a sauna challenge and lower forehead oil.Source 2 · Clinical trialEffect of Regular Sauna on Epidermal Barrier Function and Stratum Corneum Water-Holding Capacity in vivo in Humans: A Controlled StudyKowatzki D, Macholdt C, Krull K, et al.. Dermatology, 2008.Read the paper ↗PubMed ↗

  4. DoseDoes the studied protocol match how people use it?

    18/25

    The barrier study's challenge was two 15-minute rounds at 80°C, and the abstract doesn't say how often its regular group went.Source 2 · Clinical trialEffect of Regular Sauna on Epidermal Barrier Function and Stratum Corneum Water-Holding Capacity in vivo in Humans: A Controlled StudyKowatzki D, Macholdt C, Krull K, et al.. Dermatology, 2008.Read the paper ↗PubMed ↗ We found no independent measurement of the light dose a sauna red-light panel delivers.

The claim drifts from the data here

The red-light pitch borrows from light-therapy trials that used measured doses from dedicated devices. One gave 611–650 nm light at 8.5–9.6 J/cm² per session twice a week for 30 sessions, and it was industry-funded with non-randomized controls.Source 14 · Clinical trialA Controlled Trial to Determine the Efficacy of Red and Near-Infrared Light Treatment in Patient Satisfaction, Reduction of Fine Lines, Wrinkles, Skin Roughness, and Intradermal Collagen Density IncreaseWunsch A, Matuschka K. Photomedicine and Laser Surgery, 2014.Read the paper ↗PubMed ↗ We found no independent measurement of what a sauna panel delivers at skin distance, and far-infrared heaters at 300–400°C give off almost nothing below 1.1 µm, which is the top of the range light therapy uses.Source 15 · ReviewFar infrared radiation (FIR): Its biological effects and medical applicationsVatansever F, Hamblin MR. Photonics & Lasers in Medicine, 2012.Read the paper ↗PubMed ↗Source 16 · ReviewLow-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoringAvci P, Gupta A, Sadasivam M, et al.. Seminars in cutaneous medicine and surgery, 2013.Read the paper ↗PubMed ↗

The glow story also leaves out heat-sensitive skin. Heat is a recognized rosacea trigger, and in experiments near-infrared light raised an enzyme that breaks down collagen.Source 5 · GuidanceFactors That May Trigger Rosacea Flare-UpsNational Rosacea Society. National Rosacea Society, 2026.Read the paper ↗Source 7 · Clinical trialInfrared Radiation-Induced Matrix Metalloproteinase in Human Skin: Implications for ProtectionSchroeder P, Lademann J, Darvin ME, et al.. Journal of Investigative Dermatology, 2008.Read the paper ↗PubMed ↗

Put it to use

Enjoy the sauna for the heat, and judge skin treatments on their own evidence. If you have rosacea or melasma, watch how your skin reacts to heat, and if redness persists after infrared sessions, Germany's radiation protection office advises stopping and seeing a doctor.Source 17 · RegulatorAnwendungen von Infrarot-Strahlung in Medizin und Wellness [Applications of infrared radiation in medicine and wellness]Bundesamt für Strahlenschutz. German Federal Office for Radiation Protection (BfS), 2026.Read the paper ↗

From our sister magazine

Sauna Monthly explains what full-spectrum means on an infrared spec sheet

Sauna Monthly · Guide

Sauna Monthly decodes infrared sauna marketing

It explains what low-EMF and full-spectrum mean on a spec sheet.

Read it on Sauna Monthly

People also ask

Does sauna help acne?

No study has tested it. A 2023 dermatology letter found no research on infrared saunas and skin, and 23 non-medical web sources claimed benefits such as clearer skin or less acne.Source 1 · ReviewPopularity of infrared saunas and potential dermatologic risks: A Google Trends analysisPan S, Gallo Marin B, Ragi SD, et al.. Clinics in Dermatology, 2023.Read the paper ↗PubMed ↗

Is sauna bad for rosacea?

Heat is a common trigger. In a patient survey of 1,066 people with rosacea, 75% named hot weather and 51% hot baths, and a case-control study found a regular heat-bathing habit in 35% of patients against 19% of controls.Source 4 · DatasetRosacea Triggers SurveyNational Rosacea Society. National Rosacea Society, 2026.Read the paper ↗Source 6 · Cross-sectional studyInvestigation of skincare habits and possible rosacea triggers of patients with rosacea: A prospective case–control studyGuder H. Northern Clinics of Istanbul, 2024.Read the paper ↗PubMed ↗

Do red-light panels in saunas work for skin?

We found no independent measurement of what those panels deliver at skin distance. The trials that report skin gains used set doses from dedicated devices, twice a week for 30 sessions.Source 14 · Clinical trialA Controlled Trial to Determine the Efficacy of Red and Near-Infrared Light Treatment in Patient Satisfaction, Reduction of Fine Lines, Wrinkles, Skin Roughness, and Intradermal Collagen Density IncreaseWunsch A, Matuschka K. Photomedicine and Laser Surgery, 2014.Read the paper ↗PubMed ↗

Check these claims next

68°H

Stretched

Heat

“You can sweat out toxins in a sauna.”

Sweat carries traces of metals and chemicals, and the studies that report large amounts relied on sweat people scraped off their own skin. When researchers collected sweat carefully, a session's worth held a small fraction of what the kidneys clear in a day.

62°H

Stretched

Heat

“Infrared heat penetrates 3 to 4 cm into your body.”

Sauna sellers were promising an inch and a half of penetration by 1998, with no study behind it. When researchers finally put probes in muscle, warming fell from 3.0°C at 1.4 cm to 1.1°C at 3.4 cm, and core temperature did not move.

64°H

Stretched

Heat

“Sauna lowers inflammation in your body.”

Finnish men who took the most saunas had slightly lower levels of the inflammation marker CRP, and the link was weak. Trials that heated people for weeks found no change in CRP, and a single session nudges some inflammatory signals up.

We cited these sources

  1. 01Pan S, Gallo Marin B, Ragi SD, Lim RK, O'Connell KA, Libby TJ. Popularity of infrared saunas and potential dermatologic risks: A Google Trends analysis. Clinics in Dermatology. 2023;41(6):789-790. doi:10.1016/j.clindermatol.2023.10.003 PMID 37838356
  2. 02Kowatzki D, Macholdt C, Krull K, Schmidt D, Deufel T, Elsner P, et al.. Effect of Regular Sauna on Epidermal Barrier Function and Stratum Corneum Water-Holding Capacity in vivo in Humans: A Controlled Study. Dermatology. 2008;217(2):173-180. doi:10.1159/000137283 PMID 18525205
  3. 03Atencio JK, Reed EL, Wiedenfeld Needham K, Lucernoni KM, Comrada LN, Halliwill JR, et al.. Comparison of thermoregulatory, cardiovascular, and immune responses to different passive heat therapy modalities. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 2025;329(1):R20-R35. doi:10.1152/ajpregu.00012.2025 PMID 40332494
  4. 04National Rosacea Society. Rosacea Triggers Survey. National Rosacea Society. 2026.
  5. 05National Rosacea Society. Factors That May Trigger Rosacea Flare-Ups. National Rosacea Society. 2026.
  6. 06Guder H. Investigation of skincare habits and possible rosacea triggers of patients with rosacea: A prospective case–control study. Northern Clinics of Istanbul. 2024;11(1):27-37. doi:10.14744/nci.2023.33410 PMID 38357320
  7. 07Schroeder P, Lademann J, Darvin ME, Stege H, Marks C, Bruhnke S, et al.. Infrared Radiation-Induced Matrix Metalloproteinase in Human Skin: Implications for Protection. Journal of Investigative Dermatology. 2008;128(10):2491-2497. doi:10.1038/jid.2008.116 PMID 18449210
  8. 08Kim MS, Kim YK, Cho KH, Chung JH. Regulation of type I procollagen and MMP-1 expression after single or repeated exposure to infrared radiation in human skin. Mechanisms of Ageing and Development. 2006;127(12):875-882. doi:10.1016/j.mad.2006.09.007 PMID 17067654
  9. 09Barolet D, Christiaens F, Hamblin MR. Infrared and skin: Friend or foe. Journal of Photochemistry and Photobiology B: Biology. 2016;155:78-85. doi:10.1016/j.jphotobiol.2015.12.014 PMID 26745730
  10. 10Sarkar R, Jagadeesan S, Basavapura Madegowda S, Verma S, Hassan I, Bhat Y, et al.. Clinical and epidemiologic features of melasma: a multicentric cross‐sectional study from India. International Journal of Dermatology. 2019;58(11):1305-1310. doi:10.1111/ijd.14541 PMID 31187480
  11. 11Harview CL. Erythema Ab Igne: A Clinical Review. Cutis. 2023;111(4):E33-E38. doi:10.12788/cutis.0771 PMID 37289686
  12. 12Arnold AW, Itin PH. Laptop Computer–Induced Erythema ab Igne in a Child and Review of the Literature. Pediatrics. 2010;126(5):e1227-e1230. doi:10.1542/peds.2010-1390 PMID 20921068
  13. 13Radmanesh M. Erythema ab igne following Sauna belt use for abdominal obesity and cellulite. International Journal of Dermatology. 2009;48(1):94-95. doi:10.1111/j.1365-4632.2009.03826.x PMID 19126061
  14. 14Wunsch A, Matuschka K. A Controlled Trial to Determine the Efficacy of Red and Near-Infrared Light Treatment in Patient Satisfaction, Reduction of Fine Lines, Wrinkles, Skin Roughness, and Intradermal Collagen Density Increase. Photomedicine and Laser Surgery. 2014;32(2):93-100. doi:10.1089/pho.2013.3616 PMID 24286286
  15. 15Vatansever F, Hamblin MR. Far infrared radiation (FIR): Its biological effects and medical applications. Photonics & Lasers in Medicine. 2012;1(4):255-266. doi:10.1515/plm-2012-0034 PMID 23833705
  16. 16Avci P, Gupta A, Sadasivam M, Vecchio D, Pam Z, Pam N, et al.. Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring. Seminars in cutaneous medicine and surgery. 2013;32(1):41-52. PMID 24049929
  17. 17Bundesamt für Strahlenschutz. Anwendungen von Infrarot-Strahlung in Medizin und Wellness [Applications of infrared radiation in medicine and wellness]. German Federal Office for Radiation Protection (BfS). 2026.