Last updated: October 1, 2026
New to the Dead Sea? Our Dead Sea guide covers the salt, the mud, the water and the 26 Dead Sea minerals in one place.
Dead Sea Salt vs Epsom Salt: What Is the Real Difference?
Dead Sea salt and Epsom salt are both marketed for baths and both contain magnesium, but they are different minerals from different sources. Epsom salt is magnesium sulfate, a single manufactured compound. Dead Sea salt is dominated by magnesium chloride and also carries potassium, calcium, and bromide, drawn from water 1,400 feet below sea level, the lowest point on Earth. SEACRET sources its Dead Sea mineral skincare from this same water, using 26 Dead Sea minerals.
What Is Magnesium Sulfate (Epsom Salt)?
Magnesium sulfate, commonly called Epsom salt, is a compound of magnesium, sulfur, and oxygen that dissolves easily in warm water. It has been used in baths for generations as part of a relaxation and self-care ritual. Many people include Epsom salt baths in a post-workout routine to help muscles feel more relaxed. Epsom salt is also used outside the bathroom, most commonly to correct magnesium deficiencies in garden soil, and, in specific oral forms under medical guidance, as a short-term laxative. That oral, medical use is unrelated to bathing and is not a claim about any bath product.
What Is Magnesium Chloride, and Does the Skin Actually Absorb It?
Magnesium chloride is a compound of magnesium and chloride, commonly used in topical products such as lotions, sprays, and bath salts because of its solubility in water. Whether magnesium applied to the skin is meaningfully absorbed into the bloodstream, however, remains scientifically unresolved.
A 2017 review published in Nutrients, "Myth or Reality: Transdermal Magnesium?" (Gröber and Kisters, 2017), found the evidence for transdermal magnesium absorption inconclusive, noting that most claims of enhanced bioavailability are not yet substantiated by rigorous human trials. Bath salts should be chosen for the bathing experience itself, not relied on as a substitute for dietary magnesium intake.
Magnesium chloride bath salts are best understood as part of a skin care and relaxation ritual, not a verified delivery method for systemic magnesium.
Magnesium Chloride vs Magnesium Sulfate: How Do They Compare?
The clearest differences between the two are mineral profile and source, not proven absorption superiority.
| Epsom Salt (Magnesium Sulfate) | Dead Sea Salt (Magnesium Chloride and other minerals) | |
|---|---|---|
| Primary mineral | Magnesium sulfate | Magnesium chloride |
| Additional minerals | None significant | Potassium, calcium, bromide |
| Source | Commercially manufactured | Dead Sea, 1,400 feet below sea level |
| Mineral concentration | Standard | 40x the magnesium of ordinary seawater |
| Common bath use | Muscle relaxation ritual | Full mineral bathing ritual, skin-softening feel |
Why Is Dead Sea Salt Different From Ordinary Sea Salt?
Dead Sea salt differs from ordinary sea salt in both source and concentration.
Dead Sea water sits at 1,400 feet below sea level, the lowest point on Earth's surface, and carries 40 times the magnesium of ordinary seawater (deadsea.com, Dead Sea Health Benefits: Science and Evidence). SEACRET Dead Sea mineral skincare is formulated with 26 Dead Sea minerals sourced from this water.
The mineral density is also why almost nothing lives in the Dead Sea itself; the concentration that makes it inhospitable to fish is the same concentration that makes the water mineral-rich for bathing.
How Often Should You Use Magnesium Bath Salts?
Most people can use magnesium bath salts, whether Epsom salt or Dead Sea salt, 2 to 3 times a week as part of a regular self-care routine. Start with shorter, less frequent baths if you have sensitive skin, and stop use if irritation occurs. Anyone who is pregnant, nursing, or managing a medical condition should check with a healthcare professional before adding magnesium bath salts to their routine.
Frequently Asked Questions
What is the difference between magnesium chloride and magnesium sulfate?
Magnesium sulfate (Epsom salt) and magnesium chloride are both magnesium compounds used in bath products, but they differ in composition and where they occur naturally. Magnesium chloride is the dominant magnesium salt in Dead Sea water, present alongside potassium, calcium, and bromide. Magnesium sulfate is more commonly manufactured for household Epsom salt products.
Is Dead Sea salt better than Epsom salt for a bath?
Dead Sea salt carries a broader mineral profile than Epsom salt, including magnesium chloride, potassium, calcium, and bromide at high concentration, compared to Epsom salt's single compound, magnesium sulfate. Many people prefer Dead Sea salt baths for the fuller sensory experience and the skin-softening feel it leaves behind. Neither is a medical treatment; both are cosmetic bath additives, not drugs or supplements.
Does the body actually absorb magnesium through the skin?
The science on transdermal magnesium absorption remains limited. A 2017 review in Nutrients (Gröber and Kisters) found the evidence inconclusive, and no bath product should be relied on as a substitute for dietary magnesium intake. Bath salts are best chosen for the bathing ritual itself, the mineral-rich water, the warmth, and the way skin feels afterward, rather than for a guaranteed internal magnesium boost.
How often can I use Dead Sea or Epsom bath salts?
Most people can use magnesium bath salts 2 to 3 times a week as part of a regular self-care routine. Start with shorter, less frequent baths if you have sensitive skin, and discontinue use if irritation occurs. Anyone pregnant, nursing, or managing a medical condition should check with a healthcare professional first, since individual needs vary and this is general guidance, not personalized medical advice.
These statements have not been evaluated by the Food and Drug Administration. SEACRET products are cosmetics intended to improve the appearance of skin and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary. This article is for informational purposes only and does not constitute medical advice; consult a qualified healthcare professional before making changes to your health regimen.
