/ Research Lab · The evidence

The sauna science library.

Every wellness claim made by sauna brands, mapped to the actual published research — and graded on evidence strength from A to F. No pay-to-rank placements, ever: a site that tells you what is false is honest.

8Claims indexed

11Studies cited

100%Citations link to PubMed

A–FEvidence grades

AStrong evidenceMultiple RCTs or large prospective cohorts

BGood evidenceSmall RCTs or consistent observational

CSome evidenceLimited data, plausible mechanism

DWeak evidenceTrace findings, no clinical significance

FDebunked / no evidenceClaim not supported by literature

“Sauna reduces symptoms of depression”

Good evidence · 2 studies · infrared, traditional

Small RCTs show acute mood improvement and reduced depression scores after single and repeated whole-body heat sessions. Mechanisms likely involve dynorphin/endorphin release and reduced inflammation.

⚠ CaveatSample sizes are small (n<30 in RCTs). Sauna is a complement to — not a replacement for — evidence-based mental health care.

JAMA Psychiatry · 2016 · PMID 27172277 Whole-body hyperthermia for the treatment of major depressive disorder: a randomized clinical trial Finding: Single heat session reduced depression scores for 6 weeks Medical Principles and Practice · 2018 · PMID 30173212 Sauna Bathing and Risk of Psychotic Disorders: A Prospective Cohort Study Finding: Frequent sauna use associated with lower psychosis risk

#mood#depression#mental health

See our sauna guides for daily mood ritual →

“Post-exercise sauna improves muscle recovery”

Good evidence · 2 studies · infrared, traditional

Heat exposure post-training increases heat-shock protein expression and may reduce DOMS. Small studies in endurance athletes show improved time-to-exhaustion after 3-week sauna protocols.

⚠ CaveatMost data is from trained male athletes. Effects may vary in untrained or female populations.

Journal of Science and Medicine in Sport · 2007 · PMID 16877041 Effect of post-exercise sauna bathing on the endurance performance of competitive male runners Finding: 32% improvement in run time to exhaustion Cell Stress and Chaperones · 2020 · PMID 31823288 Heat acclimation-induced intracellular HSP70 in humans: a meta-analysis Finding: HSP70 upregulation after repeated heat exposure

#recovery#athletes#muscles

See saunas athletes use for recovery →

/ MethodologyClaims are graded with a GRADE-framework-adapted rubric, and every citation links to PubMed so you can verify it yourself. Seed grades are provisional pending expert review. Read our full methodology.

/ Submit a claimSeen a sauna brand make a claim we haven't indexed? Send it to us and we'll research it.

/ Learn the languageFrom löyly to low-EMF: every sauna term explained in the glossary. Popular myths get their own verdicts in the Myth-Buster.