You’ve probably heard it before: “Take an Epsom salt bath. Your body will absorb the magnesium and you’ll feel amazing.”
Epsom salts have become almost synonymous with self-care. They’re in bath rituals, recovery routines, wellness spas and countless “detox” recommendations.
But what exactly are Epsom salts?
And are they really the natural mineral many of us assume they are?
First things first: What is Epsom salt?
Epsom salt is magnesium sulfate (MgSO₄).
Despite the name, it isn’t the same thing as table salt, and it isn’t simply “magnesium.” It is a specific mineral compound made up of magnesium, sulfur and oxygen.
And here’s where things get interesting.
The fact that something is manufactured or purified doesn’t automatically make it dangerous—and the fact that something is natural doesn’t automatically make it healthy.
At Heartcore Wellness, we believe it’s worth looking beyond the marketing and asking a better question:
What does the evidence actually tell us?
The magnesium bath myth
One of the biggest claims surrounding Epsom salt baths is that your skin absorbs significant amounts of magnesium while you soak.
It sounds logical. After all, magnesium is an essential mineral, and Epsom salt contains magnesium.
But the science is much less certain.
Research into transdermal magnesium—the idea that magnesium can pass through the skin and meaningfully increase the body’s magnesium levels—is still inconclusive. Some laboratory research has found that magnesium ions can penetrate skin under certain conditions, while newer research suggests that intact skin is a substantial barrier and that meaningful systemic absorption from a simple magnesium sulfate bath is unlikely under normal conditions. Permeation of topically applied Magnesium ions through human skin is facilitated by hair follicles.
So while an Epsom salt bath may be a wonderfully relaxing ritual, we shouldn’t automatically assume that soaking in it is equivalent to taking a magnesium supplement.
Natural doesn’t always mean better
This is an important conversation in wellness.
We often hear:
Natural = good.
Synthetic = bad.
But chemistry doesn’t work quite that simply.
A mineral compound doesn’t become harmful simply because it has been purified or produced commercially. And something being mined directly from the earth doesn’t automatically make it safer or more bioavailable.
In fact, magnesium sulfate has a long history of medical and cosmetic use, and safety assessments have found magnesium sulfate to be safe in the cosmetic applications evaluated.
So we don’t need to fear Epsom salts.
We simply need to be honest about what they can—and can’t—do.
So why do people love Epsom salt baths?
Because a bath itself can be a powerful wellness ritual.
Warm water can encourage you to slow down, step away from screens and give your body and mind some much-needed quiet.
Adding Epsom salts can make that ritual feel even more intentional.
And there is research suggesting that mineral-rich bathing can benefit the skin. For example, one study found that bathing in magnesium-rich Dead Sea salt improved skin hydration and barrier function in people with dry, atopic skin. However, that evidence shouldn’t automatically be transferred to ordinary Epsom salt baths, because the mineral composition is different.
In other words:
Enjoy the bath. Enjoy the ritual. Just don’t feel pressured to believe that you’re “detoxing” your body or dramatically replenishing your magnesium through your skin.
What about magnesium chloride?
Magnesium chloride is another form of magnesium commonly found in wellness products, including magnesium flakes and topical preparations.
It is chemically different from magnesium sulfate, so the two shouldn’t simply be treated as interchangeable.
And despite claims that one form is automatically “more natural,” “more bioavailable” or dramatically better absorbed through the skin, the evidence for transdermal magnesium remains limited.
That’s why we think the most useful approach is to look at the whole product, the quality of the ingredients and what you’re actually trying to achieve, rather than choosing something simply because the packaging says “natural.”
Your wellness ritual doesn’t have to be complicated
You don’t need a bathtub full of miracle ingredients to take care of yourself.
You need time.
Warm water.
A quiet bathroom.
A few deep breaths.
Your phone somewhere out of reach.
Whether you choose Epsom salts, magnesium chloride flakes or simply a warm bath, the most valuable part may be giving yourself permission to stop.
Because wellness isn’t about believing every claim you see on a label.
It’s about becoming more curious about what you’re putting on, in and around your body.
At Heartcore Wellness, that’s the kind of wellness we believe in: less hype, more awareness; less fear, more informed choice.
So next time you reach for the Epsom salts, don’t ask yourself, “Is this natural enough?”
Ask a better question:
“Why am I using this, and what do I actually know about it?”
That’s where real wellness begins.