Epsom Salt – To Soak or Not to Soak

Tom Wigginton • September 26, 2016
Epsom Salt – To Soak or Not to Soak

Epsom salt, named for a bitter saline spring at Epsom in Surrey, England, is not actually salt but a naturally occurring pure mineral compound of magnesium and sulfate. Long known as a natural remedy for a number of ailments, Epsom salt has numerous health benefits as well as many beauty, household, and gardening-related uses.


Studies have shown that magnesium and sulfate are both readily absorbed through the skin, making Epsom salt baths an easy and ideal way to enjoy the associated health benefits. Magnesium plays a number of roles in the body including regulating the activity of over 325 enzymes, reducing inflammation, helping muscle and nerve function, and helping to prevent artery hardening. Sulfates help improve the absorption of nutrients, flush toxins, and help ease migraine headaches. ~ SaltWorks

These are the first two paragraphs on a website that describes and embraces the virtues of epsom salt. (They also sell a variety of salts for cooking and therapeutic benefits.)

For several years, I’ve been enthusiastically recommending epsom salt (magnesium sulfate) baths and foot-soaking to relieve muscle aches and pains and to speed up recovery after a series of challenging workouts. My own experience supports the use of epsom salt but what does the critical scientific research say? I was surprised at the volume of information and the lack of a consensus.


At first I searched simply for the “benefits of epsom salt baths” on PubMed. It came back with no items found. Then I replaced epsom salt with magnesium sulfate. No items found. Then I searched just for magnesium sulfate. 8750 articles. Finally I narrowed it down and discovered some interesting stuff.


As background, magnesium plays a critical role in health and core bodily functions. Essentially, it’s a calcium antagonist which, in very simple terms, means that where calcium helps muscles contract, magnesium helps them relax. When the two are out of balance, one can experience a wide variety of issues ranging from minor muscle cramps to very serious cardiac and nervous disorders. Magnesium is also vital to the structural function of proteins and mitochondria, and plays a role insulin secretion. Magnesium intake is commonly inadequate in the western diet plus we sweat it out when we work out. This is why we should be concerned.


Reading on, I discovered that magnesium has been widely studied for a number of conditions including inflammation, preeclampsia and other pregnancy related health concerns, asthma, heart attacks, menstrual pain, migraines and constipation. The delivery of magnesium for all these issues is interesting. Administering magnesium intravenously and orally is used most frequently. There are some calls for magnesium sulfate to be made into a paste and applied to affected areas with a gauze wrap.


But soaking one’s body in a solution of magnesium sulfate (at any concentration) doesn’t seem to be supported in the research. When you buy a bag of epsom salt, it says right there to mix a couple of cups or more of salt in a warm bath to relieve minor cramps, sprains, bruises, etc. But the research supporting that is surprisingly lacking. One often sited study that claims transdermal absorption absolutely works has been discredited for lack of generally accepted research protocols although their statistics for magnesium absorption are impressive. However, it’s important to note that while there’s a lack of evidence that says it does work, I found nothing that says it does not work.


Let’s look at other ways you can get magnesium for a moment. Magnesium is found in green vegetables, nuts, seeds and unprocessed grains. Drinking water is a decent source. Legumes, fruit, meat and fish are “intermediate” sources. Processed foods have a much lower magnesium content and dietary intake of magnesium in the western world is decreasing owing to the consumption of processed food. With the omnipresence of processed foods, boiling and consumption of de-mineralized soft water, most industrialized countries are deprived of their natural magnesium supply. There are oral supplements and better sports drinks (like Skratch Labs!) do their part to help replenish magnesium and other electrolytes lost through sweat.


So, to soak or not to soak? That is the question.

The answer? My advice is to soak. At least try it. Here’s why. Your great-grandmother did it. Your grand-mother did it. Maybe your mom did it. Maybe they did it because it works. I do it because it works for me. I can tell you that a foot bath with 2 cups of epsom salts in about a gallon of water makes my feet feel amazing after about 12-15 minutes of soaking.


The crux of the matter: If transdermal absorption of magnesium works, you’re helping to remedy a potential electrolyte imbalance that will help relax (and maybe hydrate) tissues that are sore, cramped and likely leading to other issues including movement compensations that can have further implications up the kinetic chain.


If you try it and feel like you got absolutely nothing from it, it’s possible that you don’t have a magnesium deficiency. Or, your ancestors and I fell for the placebo affect. What do you have to lose? 15 minutes? You don’t have to tell anyone you tried it. What do you have to gain? You might not have felt this good and relaxed since who knows when.


Here are some of the articles I’ve referenced to write this post:


Are you still interested in learning more? Learn more from our highly-skilled personal trainers in Wheat Ridge, CO. Contact us today!

You might also enjoy these posts . . .

By Tom Wigginton June 5, 2025
How to create a cardio habit and turn it into a cardio lifestyle. We’ve talked about why cardio matters . You’ve got a handle on tr aining zones . And you’ve seen how we program your cardio training to maximize efficiency and results. But knowledge alone doesn’t build consistency. Cardio becomes the life-changing ingredient in your life when it becomes routine. So let’s talk about how to get started and how to make it stick —even if you don’t love it, even if your schedule is full, even if you’ve tried and failed before. This article is written mostly for the dabblers . The key is to get started, keep moving, and eventually create a new identity for yourself as someone who finds joy in their daily cardio habit. And to be clear, this isn’t about becoming a pro athlete. It’s about living longer, living better, protecting your independence as you age, and showing up for the future you want.
By Tom Wigginton May 30, 2025
How to build a cardio plan that matches your goals—whether you're in it to win it or just want to feel 10 years younger. Nobody wants to rust out too early and yet, not everybody wants to race either. Most people fall somewhere in between. Maybe you’re not chasing a podium, but you are chasing longevity and quality of life. Or, maybe you’re not training for a triathlon, but you do like to enjoy a long hike without needing three days to recover. Or maybe you are chasing podiums, glory, and fame! In any case, that's great! In part 1 of this series, we talked about Why Cardio Matters . In part 2, we talked about gauging your effort levels by Decoding Your Training Zones . If you haven’t read those, you will find them helpful. Whether your goal is vitality , confidence , or competition , there’s a cardio plan that fits. The trick is structuring it smartly based on what your body needs and your life allows.
By Tom Wigginton May 23, 2025
How you can train smarter to live longer, live better, and stay active and independent — maybe into your 90s or 100s. In our previous article, Why Cardio Matters , we talked about the benefits of doing cardio (like living longer) and introduced you to a few terms that might have been new: Zone 2, VO₂ Max, and lactate clearance. We also offered a general recommendation for how much cardio to do weekly. This article takes the next step: breaking down how the intensity you work at affects the benefits you get from each training session. The science of exercising is rich, complex, exciting, and overwhelming. Besides the fact that it is indeed complicated, it’s made worse by having acronyms for everything, buzzy catchphrases, and intimidating fitness personalities. This is where I’m going to try to make this easier to understand, convey why you should care, and encourage you to add cardio to your daily, weekly, monthly, seasonal lifestyles.
By Tom Wigginton May 16, 2025
“Doing cardio.” What even does that mean? For some people, it’s hopping on the rower, bike, ski erg, treadmill, or elliptical and checking the box for however long Tom said to do it, then sneaking out before anyone asks questions. Others train for sanity. It helps manage stress, clear the mind, and release a flood of feel-good chemistry. Also in this category are people who actually just love to run, bike, swim, or play sportsball purely for the fun. And then there are those training for performance—to win races, set PRs, and push personal limits. All of this is cardio. And yet, when you zoom out and look at the data, it becomes clear that cardiovascular fitness does something that has a very measurable outcome: it extends your lifespan . And while we’ve all heard that cardio is good for your heart, most people don’t realize just how deep that benefit runs. And as in the case of so many other aspects of life, the broader public often benefits from the insights that trickle down from elite performance research. So whether you're reluctantly doing cardio or chasing a vibe, you’re tapping into the same physiological systems that turn podium-seekers into podium winners.
How to Select the Right Weight for Each Lift
By Tom Wigginton May 9, 2025
Question: “How do I select a weight for an exercise, and when should I go up?” We get this question literally several times every single day. And the answer isn't just “go heavier.” The answer is: it depends. Heavier is better—when heavier is appropriate. Sometimes you should go lighter and move faster. Sometimes you should go longer with the same weight. Sometimes you shouldn’t lift at all. Smart weight selection is about clarity, context, and responsiveness. Here’s how we think through it: 1. Is the Movement High-Quality? Before anything else, we ask: Are you doing the movement well? This is Phase 3 work— movement mastery . If you’re still learning the pattern, ironing out inefficiencies, or rebuilding capacity post-injury, weight selection should support technical precision. That means: Moving in clean lines Feeling the right muscles Owning each rep from start to finish
Strength Training and Prostate Cancer: What the Research Says — and How to Get Started
By Tom Wigginton May 9, 2025
A prostate cancer diagnosis can feel like a loss of control. Treatments like hormone therapy or radiation are often necessary and effective, but they can come with side effects that chip away at quality of life — fatigue, muscle loss, weight gain, anxiety, and more. But there’s a growing body of research that points to something powerful you can control: your strength. Strength Training as a Therapeutic Tool Over the past decade, studies have consistently shown that regular, structured exercise — particularly strength training — can improve outcomes for men with prostate cancer. Here’s what the science tells us:
Show More