Sweating removes toxins from the body
Sweating's primary function is thermoregulation, not detoxification. The liver and kidneys are the body's main organs of detoxification. While trace amounts of some metals and metabolites can be detected in sweat, the quantities are too small to be clinically significant for toxin removal.
What we know
The belief that sweating removes toxins is a popular health claim frequently used to market saunas, detox programs, and intense exercise regimens. The body's actual detoxification systems are the liver (which metabolizes drugs, alcohol, and other compounds) and the kidneys (which filter blood and excrete waste products in urine). The intestines also play a role in eliminating metabolic waste.
Sweat is produced by eccrine glands and consists primarily of water (99%), electrolytes such as sodium and chloride, and small amounts of other substances. Some research has detected trace quantities of heavy metals such as lead, mercury, and arsenic in sweat, as well as some metabolic byproducts. A 2022 study in the International Journal of Environmental Research and Public Health confirmed measurable but small quantities of metals including nickel, lead, copper, arsenic, and mercury in sweat.
However, these amounts are generally insignificant compared to what the kidneys excrete, and the clinical relevance for detoxification is minimal. UAMS Health has noted that forcing the body to perspire through heat or heavy exercise can actually cause the kidneys to conserve water (and thus retain any circulating toxins) rather than excrete them. Losing large amounts of fluid through sweating without adequate rehydration also risks electrolyte imbalance.
The International Hyperhidrosis Society and other medical authorities state that sweating is primarily a cooling mechanism and does not serve as a meaningful detoxification pathway under normal conditions.
Common claims
- Sweating in a sauna detoxes the bodyNo significant toxin removal demonstrated
- Sweat carries toxins and metabolic waste out of the bodyTrace amounts only; kidneys do far more
- You need to sweat more to stay healthyNo evidence for a sweating-based health benefit
- Athletes are healthier partly because they sweat moreBenefits come from exercise, not the sweating itself