Epsom salt is widely recommended online for eczema relief, but the evidence behind it is surprisingly thin. No clinical studies have directly tested Epsom salt baths for eczema. The idea that it helps comes mostly from research on Dead Sea salt, which contains magnesium along with other minerals, and from the general principle that magnesium can reduce inflammation. That doesn’t mean Epsom salt baths are useless for eczema, but the honest answer is that the benefits are unproven and largely anecdotal.
What the Research Actually Shows
Much of the excitement around Epsom salt and skin conditions traces back to studies on Dead Sea salt. A 2005 study found that bathing in Dead Sea salt solution improved skin barrier function, increased hydration, and reduced inflammation, likely because the salt is rich in magnesium. Multiple studies since 2017 have supported those findings. The problem is that Dead Sea salt contains a complex mix of minerals, including calcium, sulfur, and zinc, in addition to magnesium. Epsom salt is pure magnesium sulfate.
As a 2023 review in the Indian Dermatology Online Journal put it plainly: “no such study exists for Epsom salt bathing.” The assumption that Epsom salt delivers the same skin benefits as Dead Sea salt is a logical leap, not a proven fact. Magnesium does appear to play a role in skin health and inflammation, but whether soaking in a magnesium sulfate bath delivers enough magnesium to your skin cells to make a meaningful difference in eczema remains unknown.
How Magnesium Affects the Skin
There are theoretical reasons magnesium could help. At the cellular level, magnesium interferes with calcium signaling in skin cells. Since calcium plays a key role in how skin cells mature and form the outer barrier, magnesium may influence the rate at which damaged skin repairs itself. Research published in the International Journal of Molecular Sciences found that magnesium treatment promoted skin cell migration, a process important for wound healing, while slowing certain aspects of skin cell maturation.
For eczema specifically, the skin barrier is already compromised. Whether temporarily altering skin cell behavior through a 15-minute bath produces a net benefit or could theoretically slow barrier repair is unclear. The biology is interesting but far from settled, and none of this work was done in the context of eczema patients taking baths.
Why Some People Feel Relief
Despite the lack of formal evidence, many people with eczema report that Epsom salt baths soothe their skin. A few things could explain this. Warm baths on their own hydrate the outer layer of skin, which temporarily reduces the tight, itchy feeling eczema causes. The salt dissolved in water may also have a mild anti-itch effect similar to what people experience swimming in the ocean. And the ritual itself, sitting in warm water for 10 to 15 minutes, can lower stress, which is a known eczema trigger.
It’s also possible that the magnesium is doing something beneficial that simply hasn’t been captured in a controlled study yet. Absence of evidence isn’t the same as evidence of absence. But it does mean you shouldn’t expect dramatic results or treat Epsom salt baths as a replacement for proven eczema treatments.
How to Take an Epsom Salt Bath Safely
If you want to try it, the commonly recommended ratio is 2 cups of Epsom salt per gallon of warm water. Soak for 10 to 15 minutes. Going longer or using more salt can dry out your skin, which is the opposite of what you want with eczema. Use lukewarm water rather than hot, since heat strips moisture from the skin and can trigger itching and flares.
Before your first Epsom salt bath, test a small patch of skin by applying dissolved Epsom salt to your inner forearm. Wait a few hours to check for redness, itching, or hives. If your eczema is currently weeping, cracked, or showing signs of infection, skip the salt bath entirely. Submerging broken skin in a salt solution can cause significant stinging and irritation. If you have diabetes, check with your doctor before using Epsom salt soaks.
What You Do After the Bath Matters Most
The single most important step is what happens when you get out of the water. Dermatologists use a technique called “soak and smear” that applies to any eczema bath, whether or not salt is involved. The idea is simple: soaking lets water absorb into your skin, and immediately applying a thick moisturizer or prescribed ointment traps that water inside. Oil-based products work best because water cannot pass through oil.
The key is to apply your moisturizer or ointment right away, without fully drying off. Pat your skin gently with a towel so it’s still damp, then apply your product. If you’re using a prescribed steroid or anti-inflammatory ointment, applying it to damp skin also helps the active ingredient penetrate more deeply. Skipping this step and letting your skin air-dry after a salt bath can actually leave your skin drier than before you got in.
Epsom Salt vs. Dead Sea Salt for Eczema
If you’re choosing between the two, Dead Sea salt has the stronger evidence base. Its broader mineral profile, particularly the combination of magnesium, calcium, sulfur, and zinc, appears to offer benefits that have been replicated across multiple studies. Epsom salt is cheaper and easier to find, which makes it a more practical option for regular use, but you’re essentially betting on magnesium alone doing the work.
Interestingly, even plain table salt dissolved in bath water may offer some benefit for eczema. Salt water can help reduce the bacterial load on skin, and the most common bacterial culprit in eczema flares thrives in low-salt environments. Some dermatologists recommend salt baths as a gentler alternative to bleach baths for this reason. So if Epsom salt baths do help your eczema, it may be the salt component rather than the magnesium that deserves the credit.
Keeping Expectations Realistic
Epsom salt baths are low-risk for most people with eczema and may provide mild, temporary relief from itching and dryness. They are not a treatment for eczema in any clinical sense. The American Academy of Dermatology mentions Epsom salt baths in the context of psoriasis, recommending soaks of no more than 15 minutes, but does not specifically endorse them for eczema. No major dermatology guideline does.
The most evidence-backed bathing advice for eczema is straightforward: take short, lukewarm baths daily, use a gentle cleanser or none at all, and lock in moisture immediately afterward. If adding Epsom salt to that routine makes the experience feel more soothing, there’s little downside. Just don’t let it distract from the basics that actually have strong evidence behind them: consistent moisturizing, trigger avoidance, and working with a dermatologist when over-the-counter approaches aren’t enough.