Several everyday ingredients can replace Epsom salt depending on what you are using it for, and in some cases plain warm water does most of the heavy lifting on its own. Epsom salt (magnesium sulfate) is commonly added to baths for sore muscles, used as a foot soak, mixed into garden soil, or even taken internally as a laxative. Each of those uses has a different mechanism, so the best substitute depends on which one you actually need. Perhaps the most liberating finding from recent research is that for the most popular use of all, the relaxing bath, the warm water itself deserves most of the credit.
Why the Water Deserves More Credit Than the Salt
The classic claim behind Epsom salt baths is that magnesium absorbs through your skin, relaxing muscles and easing aches from the outside in. The evidence for this is thin. A review of the available literature on transdermal magnesium concluded that the idea of meaningful absorption through the skin is scientifically unsupported.1PubMed Central. Myth or Reality-Transdermal Magnesium? A more recent laboratory study measured how much magnesium actually crosses intact skin from a simple water-based solution and found minimal permeation, with no significant difference between magnesium-treated and untreated samples after 24 hours.2PubMed. Does magnesium permeate the skin? An ex vivo investigation of magnesium ion delivery through intact and barrier-disrupted skin Only when the outer skin barrier was physically disrupted did magnesium move through in large amounts, and that is not what happens during a normal bath.
This reframes the entire question. If magnesium is not crossing your skin in meaningful quantities, then the soothing feeling of an Epsom salt bath comes largely from the heat and the buoyancy of the water. And that means a number of alternatives, including no additive at all, can give you a similar experience.
Plain Warm Water for Sore Muscles
If your main goal is easing muscle aches after exercise or a long day, a warm bath without anything added is genuinely effective. Warm water immersion causes blood vessels near the skin to widen, increasing blood flow. The resulting boost in circulation helps deliver nutrients and clear waste products from tired muscles.3PubMed Central. Effect of hot water immersion on acute physiological responses following resistance exercise The physiological effects of heat therapy include pain relief, improved blood flow, increased metabolism, and greater elasticity in connective tissues like tendons and ligaments.4PubMed. Mechanisms and efficacy of heat and cold therapies for musculoskeletal injury
Beyond heat, simply being submerged in water adds hydrostatic pressure, the gentle squeeze of water against your body. That pressure pushes fluid from swollen tissues back into the bloodstream, reduces muscle swelling, and increases cardiac output without requiring extra energy expenditure, effectively boosting circulation throughout your body.5PubMed. Physiological response to water immersion: a method for sport recovery? So a 15-to-20-minute warm bath at a comfortable temperature, somewhere around 38 to 40°C (100 to 104°F), can give you the muscle relief people associate with Epsom salt. The salt may make the ritual feel more purposeful, but the water is the active ingredient.
Sea Salt and Dead Sea Salt for Skin and Soaking
If you want to add something to the bath for a reason beyond muscle soreness, particularly for dry, irritated, or inflamed skin, sea salt is a strong substitute. Dead Sea salt, which is rich in magnesium, potassium, and calcium, has been studied specifically for skin conditions. Bathing in a Dead Sea salt solution improved skin barrier function, increased hydration in the outer layer of skin, and reduced both roughness and redness compared to plain tap water.6PubMed. Bathing in a magnesium-rich Dead Sea salt solution improves skin barrier function, enhances skin hydration, and reduces inflammation in atopic dry skin The researchers attributed these benefits largely to the magnesium content, though the salt’s other minerals likely play supporting roles.
You do not need to buy salt specifically labeled “Dead Sea” to get some benefit. Regular sea salt contains a broader mineral profile than table salt (which is almost pure sodium chloride) and creates a mildly hypertonic soak that can help with minor swelling. That said, Dead Sea salt has an unusually high concentration of magnesium and other minerals compared to typical ocean-sourced sea salt, so the skin-specific findings from that study may not fully apply to a generic sea salt bath. For general relaxation and mild skin soothing, though, a cup or two of sea salt dissolved in a warm bath is a practical Epsom salt stand-in.
Baking Soda for Itchy or Irritated Skin
Baking soda (sodium bicarbonate) is a time-tested bath additive, particularly when itchiness is the main complaint. Dermatologists have long recommended baking soda baths for conditions like eczema flares, mild sunburn, and contact dermatitis. It works differently from salt: rather than providing minerals, baking soda shifts the water’s pH slightly alkaline, which can calm inflamed, itchy skin. A half cup to a cup in a full bath is the standard home remedy amount.
Baking soda is not a direct mineral substitute for Epsom salt and will not do much for sore muscles. It is best thought of as a specific alternative for skin-related complaints, not a general drop-in replacement. If you are dealing with poison ivy, bug bites, or a rash that makes your skin feel like it is on fire, baking soda is arguably a better choice than Epsom salt anyway. For muscle recovery, stick with warm water or one of the salt options above.
Regular Table Salt for Foot Soaks and Swelling
Foot soaks are one of the most common uses for Epsom salt, and plain table salt or kosher salt can serve the purpose. Part of what a salt soak does for swollen feet is osmotic: a concentrated salt solution draws fluid from swollen tissues. Research on hypertonic salt applications for post-injury swelling found that limbs treated with saturated salt solutions showed significant decreases in both circumference and tissue pressure, while untreated control limbs did not improve meaningfully.7Academia.edu. External application of hypertonic salt solution for treatment of posttraumatic oedema
For a home foot soak, dissolving a generous amount of table salt or kosher salt in warm water creates a hypertonic environment that can help with puffiness. You will not get the magnesium that Epsom salt provides, but as discussed earlier, magnesium absorption through intact skin is minimal anyway. The combination of warm water, hydrostatic pressure on submerged feet, and the osmotic effect of salt is where the relief comes from. If you prefer a finer grain that dissolves quickly, table salt works. If you want a coarser texture, kosher salt dissolves a bit more slowly but does the same job.
Massage and Essential Oils for Post-Exercise Recovery
Not every Epsom salt alternative involves a bath. If muscle soreness after exercise is your main concern and you cannot or do not want to soak, massage is an evidence-backed option. A study on post-exercise delayed-onset muscle soreness (DOMS) found that massage with lime essential oil significantly reduced both lactic acid levels and pain intensity in athletes compared to exercise alone.8PubMed Central. Effect of Massage Therapy with Lime (Citrus Aurantifolia) Essential Oil on the Recovery of Delayed Onset of Muscle Soreness in Athletes The mechanical action of massage improves local blood flow and helps clear metabolic byproducts, while certain essential oils contain compounds with mild analgesic properties.
You do not need lime oil specifically. Peppermint oil, eucalyptus oil, and lavender oil are all commonly used for similar purposes, though the quality of evidence varies by oil. The massage itself is doing most of the work. If you have a foam roller, that is another way to achieve localized pressure and improved circulation without any product at all. For someone who finds Epsom salt baths inconvenient or who has no bathtub, targeted massage is a more practical route to the same goal.
Laxative Substitutes When Epsom Salt Was for Constipation
Epsom salt taken internally acts as an osmotic laxative, pulling water into the intestines to soften stool and stimulate bowel movements. This is a legitimate medical use, but it is one where substitutes matter more from a safety standpoint because you are actually ingesting something. Magnesium oxide, available as an over-the-counter supplement, works through a similar osmotic mechanism. In a controlled trial, subjects taking magnesium oxide reported significant improvements in bowel movements and quality of life compared to placebo, and the effect was comparable to senna, a stimulant laxative.9PubMed Central. Efficacy and Safety of Over-the-Counter Therapies for Chronic Constipation: An Updated Systematic Review
Other widely available osmotic laxatives include polyethylene glycol (sold under brand names like MiraLAX) and lactulose. These are generally considered gentler and more predictable than Epsom salt for constipation relief. Fiber supplements such as psyllium husk work by a different mechanism, bulking up stool and encouraging more regular motility. For occasional constipation, any of these are safer and better studied than dissolving Epsom salt in water and drinking it. One reason to prefer the commercial options is dosing: it is easy to accidentally take too much magnesium sulfate when you are measuring from a bag meant for bath use, and the consequences of magnesium overdose are serious enough to warrant caution.
Soil and Garden Alternatives
Gardeners use Epsom salt as a magnesium supplement for soil, particularly for plants like tomatoes, peppers, and roses that are thought to benefit from extra magnesium. If you do not have Epsom salt on hand and your soil actually needs magnesium (a soil test is the only way to know for sure), a few alternatives exist.
Dolomitic lime is the most common agricultural substitute. It supplies both magnesium and calcium and also raises soil pH, which makes it a better choice for acidic soils. If your soil is already alkaline, dolomitic lime could push the pH too high, so it is not a universal swap. Wood ash is another option that adds magnesium along with calcium, potassium, and phosphorus, and research on forest soils has shown that wood ash amendment meaningfully increases these base nutrients.10Canadian Journal of Soil Science. Wood ash as a forest soil amendment: The role of boiler and soil type on soil property response Like dolomitic lime, wood ash raises pH, so it works best on acidic soils. Compost and well-rotted manure supply smaller amounts of magnesium but contribute organic matter that improves soil structure overall.
A word of caution: many gardeners add Epsom salt routinely without ever testing their soil, and magnesium deficiency is less common than social media gardening advice suggests. Excess magnesium can interfere with calcium uptake and actually harm plants. Before reaching for any magnesium supplement, a basic soil test from your local extension service tells you whether you need it at all.
How Much Magnesium Overdose Risk Comes With Epsom Salt
While we are discussing substitutes, it is worth understanding one reason the alternatives are sometimes safer than Epsom salt itself, particularly for internal use. A case report documented a person who deliberately ingested a large amount of Epsom salt and developed a dangerously high serum magnesium level of nearly ten times the normal range. Symptoms included limb weakness, vomiting, confusion, and a rapid decline in consciousness with dangerous heart rhythm disturbances. The patient required emergency dialysis, and the authors noted that cardiac arrest risk increases at magnesium levels above roughly six times normal.11PubMed Central. Deliberate overdose with Epsom salts
This was an extreme case involving intentional poisoning, but milder versions of the problem occur when people drink Epsom salt solutions for constipation and misjudge the amount. People with kidney disease are especially vulnerable because their bodies cannot efficiently clear excess magnesium. For bath use, the risk is negligible since so little magnesium actually enters the body through intact skin. But for anyone using Epsom salt internally, switching to a commercial laxative with standardized dosing is a straightforward safety upgrade.
Matching the Substitute to the Purpose
The reason there is no single “best” Epsom salt substitute is that Epsom salt itself gets used for wildly different purposes, and the active mechanism differs each time. Here is a quick reference:
- Sore muscles: Warm water alone, at a comfortable temperature for 15 to 20 minutes, provides most of the benefit through heat and hydrostatic pressure. Add sea salt if you want the ritual of adding something.
- Dry or irritated skin: Dead Sea salt or sea salt for mineral-rich soaking; baking soda for itchiness and mild inflammation.
- Swollen feet: Table salt, kosher salt, or sea salt dissolved generously in warm water for an osmotic foot soak.
- Constipation: Magnesium oxide supplements, polyethylene glycol, or psyllium husk, all of which offer more predictable dosing.
- Garden soil: Dolomitic lime, wood ash, or compost, depending on your soil’s current pH and nutrient profile.
The persistent popularity of Epsom salt owes a lot to tradition and to the satisfying feeling of dissolving crystals into water. There is nothing wrong with using it if you have it, but the science suggests its advantages over simpler alternatives are smaller than most people assume, especially in the bath. When you run out, do not let it stop you from taking a long, hot soak.
Vinegar, Oatmeal, and Other Pantry Options
A few other household items show up in home-remedy circles as bath additives, and they are worth brief mention. Colloidal oatmeal, which is just finely ground oats, has a long history in dermatology for soothing irritated skin. It forms a protective film that traps moisture and contains compounds called avenanthramides that have mild anti-inflammatory effects. You can make a rough version at home by blending plain oats in a food processor until they form a fine powder, then stirring that powder into a warm bath. It works well for eczema flares, chickenpox itchiness, and general dryness.
Apple cider vinegar is another popular bath add-in, typically a cup or two in a full tub. The idea is that its mild acidity helps restore skin’s natural pH, which sits slightly acidic around 4.5 to 5.5. People with fungal skin issues or bacterial body odor sometimes report benefit, though rigorous clinical evidence is sparse. Undiluted vinegar on irritated skin can sting and cause further irritation, so dilution in a full bath is important. Neither oatmeal nor vinegar addresses muscle soreness the way warm water immersion does, but for skin-specific issues they fill gaps that Epsom salt was never especially good at addressing in the first place.