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← All articlesShort answer: a sauna makes you sweat, and sweat is mostly water and salt. The organs that clear waste from your blood are your liver and kidneys, and they do that job whether you sweat or not. A handful of small studies have found trace amounts of metals such as lead, cadmium and arsenic in sweat, sometimes at higher concentrations than in blood, but nobody has shown that a sauna session removes a meaningful share of anything from a healthy adult. What the research does support is different and, honestly, more useful: regular sauna use is linked to better blood pressure, more flexible arteries and a lower rate of cardiovascular events. So if you are booking an infrared sauna in Tarzana to "detox," here is what is actually happening in your body, what the studies found, and how to use the heat for the benefits that hold up.
Sweat is produced by eccrine glands, which cover most of your skin and exist to cool you down. When your core temperature rises, the glands pull fluid from the blood supply, and as that fluid travels up the duct to the skin, the duct reabsorbs most of the sodium and chloride. What reaches the surface is a dilute solution: water, some salt, and small amounts of potassium, lactate, urea and other compounds. A 2019 review in the journal Temperature by physiologist Lindsay Baker lays out the mechanism in detail and reaches a plain conclusion: sweating plays a minor role in eliminating waste products compared with the kidneys and gut, partly because sweat glands cannot concentrate what they excrete or ramp up excretion on demand.
That is the core of the detox question. Your kidneys filter your entire blood volume many times a day and adjust what they keep and what they dump. Your liver chemically transforms compounds so they can be excreted in bile or urine. Sweat glands do neither. They move water to the skin so it can evaporate and carry heat away. Anything else that comes along is a passenger.
Two papers come up in almost every "sauna detox" article. They are worth reading carefully because the marketing versions go further than the authors did.
In 2011, Stephen Genuis and colleagues published what became known as the BUS study in Archives of Environmental Contamination and Toxicology. They collected blood, urine and sweat from 20 people, ten healthy and ten with various health problems, and tested the samples for roughly 120 compounds. Toxic elements turned up in all three fluids. Several, including cadmium, were found at higher concentrations in sweat than in blood, and a few appeared in sweat but not in serum at all, which the authors attributed to storage in tissue. Their conclusion was that induced sweating "appears to be a potential method" for eliminating some toxic elements.
Note the size and design: 20 people, no control group, no measurement of how much of anyone's total body burden actually left through the skin. The study shows that metals can be found in sweat. It does not show that sweating changes the amount in your body in a way that matters for your health.
A year later, Margaret Sears and colleagues published a systematic review in the Journal of Environmental and Public Health covering arsenic, cadmium, lead and mercury in sweat. They screened 122 records and included 24 studies. The pattern was consistent: in people with high exposure or a high body burden, sweat concentrations of these metals often exceeded plasma or urine, and in some cases daily excretion through the skin could match urinary excretion. The authors' conclusion was that sweating "deserves consideration" for toxic element elimination and that properly sized trials are needed before anyone can set a safe, effective protocol.
That is a fair summary of where the science still sits in 2026. The signal is real in people who are genuinely metal-exposed, such as industrial workers. For an ordinary adult in the San Fernando Valley, the quantities involved are tiny, and no trial has shown a clinical benefit from sweating them out.
Here the evidence is thinner still, and it runs against the claim. Alcohol is cleared almost entirely by the liver; the amount that leaves in sweat is negligible, and sauna after drinking is a well-documented way to end up dehydrated or worse. Fat-soluble compounds are stored in fat tissue and processed by the liver; a review by the fact-checking group Science Feedback found no reliable evidence that saunas clear them, and the dermatologists it quoted were blunt that, for most people, heavy sweating does not detoxify anything because the kidneys are already doing it.
There is one more point worth knowing. Heavy sweating pulls water out of the body, and when you are dehydrated the kidneys conserve fluid by producing less urine. Since urine is the main route for water-soluble waste, a long, dehydrating sauna session could, in principle, briefly reduce excretion rather than increase it. The fix is simple: drink before, sip during, and replace fluids and salt after. That is good practice for any sauna session regardless of why you are there.
If detox is the weak claim, cardiovascular conditioning is the strong one. The largest body of evidence comes from Finland, where traditional sauna is a daily habit for much of the population. A 2018 review in Mayo Clinic Proceedings by Jari Laukkanen and colleagues pulled together about 70 observational and experimental studies. Regular sauna use was associated with lower blood pressure, improved arterial stiffness and endothelial function, and lower rates of sudden cardiac death, stroke, fatal coronary disease and all-cause mortality. People who were both physically fit and frequent sauna users had the lowest risk of all.
The proposed mechanism is not mysterious. Sitting in heat raises your heart rate and widens your blood vessels in a way that resembles light to moderate exercise. Repeat that several times a week and the vascular system adapts, much as it does to a walking program. The same review also noted associations with fewer headaches, less joint pain in arthritis and fibromyalgia, and improvements in some skin conditions, with the caveat that most of this evidence is observational and effect sizes vary.
Infrared saunas, like the ones in our Wellness Lounge, run cooler than Finnish saunas, typically in the 120 to 140 degree range, and heat the body more directly rather than heating the air. Most of the cardiovascular research was done in traditional saunas, so the infrared evidence is thinner, but the physiological response, a rise in core temperature, heart rate and skin blood flow, is the same lever. We cover the practical differences in infrared sauna vs traditional sauna vs steam room.
People who come out of a sauna feeling lighter and clearer are not imagining it, and it is not toxins leaving. Three things are going on. Heat relaxes skeletal muscle and raises skin blood flow, which eases stiffness. The cardiovascular load followed by cooling down triggers a parasympathetic rebound, the same calm you feel after a workout. And the rise and fall in core temperature is one of the stronger cues for sleep onset, which is why an evening session tends to improve that night's sleep; we go into the timing in sauna or cold plunge before bed. None of that requires the word detox, and all of it is repeatable.
The weight you lose on the scale after a session is water. It comes back as soon as you rehydrate, which you should. If weight is the goal, the honest picture is in does an infrared sauna burn calories.
A sauna is the wrong tool. If you have a reason to suspect heavy-metal exposure, from an occupation, an old home, imported cookware or supplements, or a known contamination, the right step is a conversation with a physician and the right blood or urine test. Our clinic runs lab testing in Tarzana through Quest, and a provider can order the specific panel your exposure calls for. Treatment for a confirmed metal burden is a medical decision, not a wellness routine.
For everyone else, the best thing you can say about the sauna is also the simplest: it is a pleasant, repeatable way to put a mild, healthy stress on your heart and blood vessels, loosen up, and sleep better. That is a good enough reason on its own.
Trace amounts of some metals have been measured in sweat, and in people with high exposure the concentration in sweat can exceed that in blood. No study has shown that sauna sessions reduce the body's total burden of a metal in a way that improves health. If you have a real exposure concern, get tested rather than sweating.
Sweat itself is nearly odorless. The smell comes from skin bacteria breaking down the compounds in sweat, and from the apocrine glands in the armpits and groin, which release a thicker secretion when you are hot or stressed. It is not toxins coming out.
Enough that you start well hydrated and finish without feeling lightheaded. A practical rule is a glass before, a bottle within reach during, and water plus a salty snack or electrolyte drink after. Weigh yourself before and after once if you are curious; the difference is almost all water to replace.
It is a sign your body is cooling itself, which is what it should do. Sweat volume varies with fitness, acclimation, hydration and genetics. Someone who barely sweats is getting the same cardiovascular stimulus as someone who drips.
No. Alcohol is cleared by the liver on its own schedule, and heat on top of a hangover deepens dehydration. Wait until you are rehydrated and feel normal before you book.
The sauna is not a detox machine, and it does not need to be. Your liver and kidneys handle that work around the clock. What a sauna offers is a well-studied cardiovascular stimulus, real relief for tight muscles and sore joints, and a reliable nudge toward better sleep, all from sitting still in the heat a few times a week. Book an infrared sauna session at the Wellness Lounge in Tarzana, bring water, and skip the detox story. The benefits that are left are the ones worth having.
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