Does magnesium really absorb through the skin?

Probably not in a meaningful way. Reviews of the evidence conclude there is little solid proof that much magnesium crosses the skin during a soak, so the relief most people feel is best explained by warm water, buoyancy, and rest. That is still a good reason to enjoy a soak.

How much Epsom salt should I use?

A common amount is about 2 cups in a standard bathtub, or roughly half a cup in a foot basin. There is no proven "correct" dose, so following the package directions is fine.

How long and how often?

About 15 to 20 minutes, a few times a week, is plenty. Longer or hotter is not better and can leave you dehydrated or lightheaded.

Can I drink Epsom salt as a remedy?

No. Taken by mouth, magnesium sulfate is a strong saline laxative with real risks, especially for people with kidney problems. Only use it internally under a clinician or the product label, never as a casual home remedy.

Who should be careful?

Check with a provider before soaking if you have kidney disease, diabetes with nerve damage, heart problems, low blood pressure, broken or infected skin, or are pregnant. Get out and rest if you feel dizzy or unwell.

← All remedies

Epsom Salt Muscle Soak

Name: Epsom Salt Muscle Soak
Total time: 20 min
Yield: 1 soak
Ingredients: 2 cups Epsom salt (for a full bath; use about 1/2 cup for a foot soak, or follow the package); 4-5 drops lavender essential oil (optional; for a calming scent, skip if fragrance bothers your skin); 1 warm bath or foot basin (comfortably warm, not hot)

An Epsom salt soak is a warm, simple way to unwind sore, tired muscles and stiff feet. Be honest with yourself about the science: the comfort is real, but it comes mostly from the warm water and rest, not from magnesium soaking through your skin. Never drink Epsom salt; the oral form is a strong laxative that needs medical guidance.

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Recipe20 min · Easy🛁Epsom Salt Muscle SoakA warm Epsom salt soak, with optional lavender, to unwind sore, tired muscles.Uses: Epsom Salt · Lavender · Warm water

Next Fennel After-Meal Tea 🫖

Brew this in the Lab

Time20 min

DifficultyEasy

Makes1 soak

Best forSore muscles

Instructions

Fill a bathtub with comfortably warm (not hot) water, or use a basin for a foot soak.
Pour in the Epsom salt and swirl the water until it dissolves.
If you like, add a few drops of lavender for a calming scent.
Soak and relax for about 15 to 20 minutes.
Rinse off with clean water and pat your skin dry.
Drink a glass of water afterward, and stand up slowly, since a warm soak can leave you a little lightheaded.

Why it may help

Epsom salt is magnesium sulfate, a mineral that dissolves easily in warm water. Soaking in a warm bath relaxes tight muscles, eases the weight off sore joints and tired feet, and gives you a few quiet minutes to unwind, which is a genuinely useful combination after a long day or a hard workout.

A few drops of lavender are optional and add a calming scent that can make the soak feel more restful. Skip it if fragrances bother your skin.

What the evidence says

The popular claim is that you absorb magnesium through your skin during a soak. Reviews of the research, including a 2017 review in Nutrients, conclude there is not enough good evidence to support meaningful absorption that way. In other words, the warm water and rest are doing most of the work.

That does not make the soak pointless, warmth and relaxation are real benefits, but it is worth setting expectations honestly. And it is a firm reminder to keep Epsom salt external: taken by mouth it is a recognized saline laxative, a medical use with real risks that should only happen under a clinician or the product's directions.

Tips & variations

No bathtub? A foot soak in a basin works the same way with about half a cup of salt.
Keep the water comfortably warm, not scalding; hotter is not more effective.
Hydrate before and after, and get up slowly to avoid feeling lightheaded.
Rinse off afterward so the salt does not leave skin feeling dry or filmy.
Moisturize while skin is still damp if soaking tends to dry you out.

FAQ

Does magnesium really absorb through the skin?: Probably not in a meaningful way. Reviews of the evidence conclude there is little solid proof that much magnesium crosses the skin during a soak, so the relief most people feel is best explained by warm water, buoyancy, and rest. That is still a good reason to enjoy a soak.
How much Epsom salt should I use?: A common amount is about 2 cups in a standard bathtub, or roughly half a cup in a foot basin. There is no proven "correct" dose, so following the package directions is fine.
How long and how often?: About 15 to 20 minutes, a few times a week, is plenty. Longer or hotter is not better and can leave you dehydrated or lightheaded.
Can I drink Epsom salt as a remedy?: No. Taken by mouth, magnesium sulfate is a strong saline laxative with real risks, especially for people with kidney problems. Only use it internally under a clinician or the product label, never as a casual home remedy.
Who should be careful?: Check with a provider before soaking if you have kidney disease, diabetes with nerve damage, heart problems, low blood pressure, broken or infected skin, or are pregnant. Get out and rest if you feel dizzy or unwell.

Safety: For external soaking only; never drink Epsom salt as a home remedy. Use warm, not scalding, water, and avoid soaking broken or infected skin. Check with a provider first if you have kidney disease, diabetes with nerve damage, heart problems, low blood pressure, or are pregnant, and get out and rest if you feel dizzy. This page is for informational purposes only, not medical advice.

Sources

Gröber U, et al. Myth or Reality, Transdermal Magnesium? Nutrients, 2017, finding insufficient evidence for meaningful magnesium absorption through the skin.
U.S. FDA and NIH information on magnesium sulfate as an over-the-counter saline laxative, including cautions for kidney disease.
NIH Office of Dietary Supplements and Mayo Clinic consumer information on magnesium and safe use.