Dead Sea salt and Epsom salt are not the same thing. They differ in chemical composition, mineral content, and how they’re best used. Epsom salt is a single compound (magnesium sulfate), while Dead Sea salt is a complex blend of over 20 minerals harvested from an ancient inland lake. The two are often used interchangeably in bath soaks, but they bring different properties to the water.
What Each Salt Is Made Of
Epsom salt is pure magnesium sulfate, a crystalline compound made of just two elements: magnesium and sulfate. It dissolves completely in water, producing a clear solution. There’s nothing else in it, no sodium, no potassium, no calcium. That simplicity is its defining feature.
Dead Sea salt is far more complex. The mineral profile of the Dead Sea is dramatically different from ocean water. Ordinary sea salt is mostly sodium chloride, but the Dead Sea’s surface water is roughly 50.8% magnesium chloride, 30.4% sodium chloride, 14.4% calcium chloride, and 4.4% potassium chloride. Authentic Dead Sea salt retains this mineral diversity, containing up to 21 different minerals including bromide. When you dissolve it in a bath, you’re soaking in a cocktail of minerals rather than a single compound.
How the Magnesium Differs
Both salts are rich in magnesium, which is the main reason people reach for either one. But the magnesium comes in different chemical forms. In Epsom salt, magnesium is bound to sulfate. In Dead Sea salt, it’s primarily bound to chloride. This distinction matters less than you might think when it comes to absorption through the skin.
A detailed review published in the journal Nutrients examined whether magnesium can actually penetrate intact skin from either source. The findings were sobering. The outermost layer of skin acts as a water-repellent barrier, and magnesium ions in solution are too large and too water-loving to pass through it in meaningful amounts. The only potential entry points are hair follicles and sweat glands, which make up just 0.1% to 1% of your skin’s surface. One study on bathing in Dead Sea water found no change in blood levels of magnesium, calcium, or other electrolytes after two hours of soaking. A separate, often-cited Epsom salt study did show a small rise in blood magnesium after 12-minute baths, but that study was never published in a peer-reviewed journal, appearing only on a commercial Epsom salt industry website.
In practical terms, neither salt is a reliable way to raise your body’s magnesium levels through a bath. The benefits people feel from soaking likely come from the warm water itself, relaxation, and possibly localized effects on the skin rather than significant mineral absorption into the bloodstream.
Skin Conditions and Dead Sea Salt
Where Dead Sea salt has a genuine edge is in managing inflammatory skin conditions, particularly psoriasis. This benefit has been studied in the context of “Dead Sea climatotherapy,” which combines bathing in mineral-rich water with controlled sun exposure at the Dead Sea’s low elevation. In a prospective study of 18 psoriasis patients who completed a four-week treatment program in Israel, researchers found an 88% reduction in a standardized psoriasis severity score. Over half the patients achieved complete skin clearance. On average, visible symptoms stayed away for about 94 days after treatment ended, with some patients remaining clear for over seven months.
It’s worth noting that these results involved the full Dead Sea environment, not just salt dissolved in a home bathtub. The combination of mineral water, unique UV exposure at 400 meters below sea level, and low humidity all play a role. Still, people with psoriasis and eczema commonly report that Dead Sea salt baths at home provide some relief from itching and flaking, even if the effect is milder than the real thing.
Epsom salt doesn’t have this same body of research for skin conditions. Its reputation is built more around muscle soreness and general relaxation.
Muscle Soreness and Bath Soaks
Epsom salt baths are the go-to folk remedy for sore muscles, post-workout recovery, and general body aches. A randomized controlled trial in the Journal of Education and Health Promotion found that Epsom salt soaks helped reduce pain in people with knee osteoarthritis, supporting its use as a complementary therapy for joint discomfort. The warm water and dissolved minerals together appear to ease stiffness and soreness, though isolating the salt’s contribution from the heat of the water remains difficult in research settings.
Dead Sea salt baths can serve this same purpose. The high magnesium content, combined with potassium and bromide (which is thought to have a calming effect), makes it a reasonable choice for a relaxation soak. For pure muscle recovery on a budget, Epsom salt is the more practical option since it costs significantly less per bath.
How to Use Each One
For an Epsom salt bath, one to two cups dissolved in a standard tub of warm water is the typical recommendation. The crystals dissolve quickly and leave no residue. For Dead Sea salt, about one cup in warm water around 95°F works well. Soak for 15 to 20 minutes in either case. You can adjust the amount based on personal preference, though more isn’t necessarily better since very concentrated salt water can be drying to the skin.
If you’re buying Epsom salt, look for USP grade on the label. This means the FDA has certified that every batch is tested for impurities, whereas technical-grade Epsom salt (sold for gardening or industrial use) undergoes less rigorous testing. For Dead Sea salt, sourcing matters. Authentic Dead Sea salt comes from Israel or Jordan, and the mineral profile can vary depending on the manufacturer’s processing methods. Products that list only “sea salt” without specifying the Dead Sea as the origin are likely ordinary sea salt with a very different mineral balance.
Where They Come From
Dead Sea salt is harvested from evaporation ponds along the shores of the Dead Sea, which straddles the border of Israel and Jordan. Companies pump water from the sea into shallow basins, where intense desert heat evaporates the water and leaves mineral-rich salt behind. This same process feeds a massive potash (fertilizer) industry, and the heavy water extraction has contributed to a dramatic environmental decline. The Dead Sea’s water level has been dropping steadily for decades, and current projections suggest it could fall 100 meters below its 1960s level by 2050, potentially making extraction economically unviable.
Epsom salt gets its name from Epsom, England, where it was first discovered in natural springs. Today it’s produced industrially on a large scale, making it widely available and inexpensive. A bag of Epsom salt at a pharmacy typically costs a fraction of what authentic Dead Sea salt runs.
Which One to Choose
Your choice depends on what you’re after. For a simple, affordable muscle-recovery soak, Epsom salt does the job. For skin conditions like psoriasis or eczema, Dead Sea salt’s broader mineral profile has more research behind it. For general relaxation, either one works, and the warm water itself deserves most of the credit.
They’re also not mutually exclusive. Some people mix both in the same bath, combining Epsom salt’s high sulfate content with Dead Sea salt’s mineral diversity. There’s no evidence this causes any problems, and if it makes your bath feel more luxurious, that’s reason enough.