Do Epsom Salt Baths Really Work? Science Weighs In on the Trend
Epsom salt baths remain a popular home remedy for muscle relaxation and general wellness. Despite widespread use, scientific evidence on their benefits—and whether the body absorbs magnesium through the skin—stays limited and debated.
Preparing an Epsom salt bath is simple: fill a tub with warm water, add around two cups of the salt, and soak for at least 12 minutes. Many claim these baths aid weight loss, detoxification, and nutrient absorption, but no solid research confirms such effects.
Studies on magnesium absorption through the skin have produced mixed results. A small 2003 report from the University of Birmingham noted slight increases in magnesium levels after repeated baths. However, later reviews—including a 2016 analysis and a 2009 study—found no convincing evidence that magnesium sulfate penetrates the skin effectively. A 2017 study did observe higher magnesium in urine after using a magnesium cream, but this does not apply to baths. While some find the practice relaxing, experts warn against daily use. Overuse may lead to magnesium toxicity, with symptoms like excessive thirst, low blood pressure, or drowsiness. Those with diabetes or kidney disease should avoid these baths entirely. For safety, consumers should choose Epsom salt labelled 'USP' with a drug facts box on the packaging.
Epsom salt baths continue as a common self-care routine, though peer-reviewed studies show little proof of significant magnesium absorption or clinical benefits. Without robust evidence, their effects remain largely anecdotal, and caution is advised for vulnerable groups or frequent users.
