Do infrared saunas actually do anything for your health?

Infrared sauna cabins have moved from recovery clinics into ordinary bedrooms and bathrooms, often sold with the same statistics that made traditional sauna famous: lower cardiovascular death, better circulation, a gentle detox along the way. Most of those headline numbers, though, come from research on a different kind of heat entirely, and separating what infrared itself has actually been tested for from what's borrowed from Finnish sauna studies changes the picture considerably.

Where the famous numbers actually come from

The sauna statistic that gets repeated everywhere, that frequent use can cut cardiovascular death by roughly half, comes from a long running Finnish cohort study on traditional dry sauna bathing, not infrared. In that research, men who used a traditional sauna 4 to 7 times a week had dramatically lower cardiovascular and all-cause mortality than those who used one just once a week, with heat causing blood vessels to dilate and blood pressure to drop. That is real, well replicated science. It is also not a study of the infrared cabins currently being marketed, which heat the body through infrared light rather than hot air, and the two methods haven't been shown to produce identical effects.

What infrared specifically has been tested for

The clearest infrared-specific evidence comes from heart failure research. A 2018 meta-analysis pooled 491 heart failure patients across several trials, where participants used infrared sauna at about 60 degrees Celsius for 15 minutes, five times a week, for 2 to 4 weeks. The result was a real improvement in ejection fraction, a key measure of how well the heart pumps, along with a drop in BNP, a blood marker of heart strain. The same review, though, rated the overall evidence moderate to insufficient, given the short follow up and modest sample sizes, and found no significant change in blood pressure.

Zoom out to broader cardiometabolic health, the kind of claim implied by most consumer marketing, and the picture gets thinner. A 2025 meta-analysis of passive heating trials, a category that includes infrared, found no improvement on most cardiometabolic or vascular health markers. In other words, the strongest infrared-specific evidence sits in a narrow clinical population over a short window, not in healthy people looking for a general wellness upgrade.

What about pain and the detox claim

Infrared's case for pain relief is a genuine mixed bag. A 2022 review of 13 studies found real pain reduction in some fibromyalgia and osteoarthritis trials, while results for chronic low back pain were more ambivalent, with some trials showing no real advantage over placebo. The "sweating out toxins" claim, meanwhile, doesn't hold up at all. Sweat is roughly 99% water, salt and urea, with only trace amounts of anything else, and the actual work of filtering substances out of the bloodstream belongs to the liver and kidneys, not the skin. A hard sweat session can leave you feeling cleansed. It isn't removing meaningful amounts of anything your organs weren't already handling.

How it compares to other recovery trends

Infrared sauna often gets marketed as the warm half of a hot-and-cold recovery routine, paired with its opposite, cold exposure. The evidence quality runs similarly mixed on both sides. Cold plunges carry their own small, short trials and their own overstated claims, covered in our look at whether cold plunges actually do what people claim. What both have going for them is low risk and a genuine, if modest, physiological effect, heat dilates blood vessels and cold constricts them, and neither delivers the sweeping metabolic overhaul that gets attached to it in a highlight reel.

Our take

Infrared sauna use is a reasonable way to relax and may genuinely help specific things, heart failure symptoms under medical guidance and certain kinds of chronic pain, based on real if modest trial data. It is not a shortcut to the dramatic Finnish sauna mortality statistics, those belong to a different kind of heat with decades more research behind it, and it is not a detox. If you're healthy and enjoy it, there's little reason to stop. If you have a heart condition, are pregnant, or take blood pressure medication, check with a doctor before making it a regular habit, and plan to hydrate well before and after either way.

This is general information, not medical advice. Talk to a clinician before changing anything, especially if you are pregnant, nursing, or managing a condition.