Salt Water and 'Salt Stomping': What a Pinch of Salt in Your Water Actually Does

Salt water on social media usually means a pinch of sea salt, Celtic salt or pink Himalayan salt stirred into a glass of water, often first thing in the morning, sold as a way to actually absorb what you drink and replace minerals. A newer trend, salt stomping, involves no swallowing at all: people pour Epsom salt or coarse sea salt into a tray and stand on it barefoot for several minutes before bed, hoping to calm down and sleep better.

The two trends make different claims, so the evidence for each is different. For the trace minerals in specialty salts, see our article on iodine, sea salt and Himalayan salt; for the salt-and-juice drink, see our adrenal cocktail review.

The US Food and Drug Administration puts average American intake at about 3,400 mg of sodium a day, against a daily limit of less than 2,300 mg, about one teaspoon of table salt². The American Heart Association recommends no more than 2,300 mg and an ideal limit of no more than 1,500 mg a day for most adults¹¹. More than 70% of that sodium comes from packaged and prepared foods rather than the salt shaker².

The National Academies set an Adequate Intake of 1,500 mg a day for adults and advise reducing intake above 2,300 mg a day, and they note that most US and Canadian groups already eat more than both³.

In a meta-analysis of 34 trials with 3,230 people, cutting salt by about 4.4 g a day for at least four weeks lowered blood pressure by about 4.2/2.1 mm Hg, with larger falls in people with high blood pressure (5.4/2.8 mm Hg) than in people without it (2.4/1.0 mm Hg)⁴.

In a trial of 20,995 adults in rural China who had either a past stroke or were aged 60 or older with high blood pressure, swapping regular salt for a substitute that was 25% potassium chloride lowered the stroke rate (rate ratio 0.86) over about 4.7 years⁵. A daily salt drink pushes in the opposite direction. See our article on potassium and blood pressure.

We found no published study of standing on salt for sleep, stress or inflammation. The ritual borrows from grounding and from Epsom salt baths. Any calm people feel is more plausibly explained by a quiet, screen-free bedtime routine than by the salt.

The magnesium idea does not hold up well either. Epsom salt is magnesium sulfate, and a 2017 review of transdermal magnesium, including sprays, flakes and salt baths, concluded that promoting magnesium absorption through the skin is scientifically unsupported, while oral magnesium is well documented⁸. The review authors declared no conflicts of interest, although two of the four list an institute at the same street address as Protina, a German maker of oral magnesium products, and one uses a protina.de email address^8,14.

Coarse crystals can scrape skin, so people with foot wounds, diabetes-related nerve damage or poor circulation have good reason to skip it. For magnesium taken by mouth, see our guide to the best magnesium supplement.

For most people at rest, plain water hydrates fine, and a pinch of salt adds to a sodium total that is already too high^1,2. Salt has a real role during long, sweaty exercise, and salt stomping is a bedtime ritual with no trial evidence behind it.