Epsom Salt vs. Regular Salt: Can You Put Table Salt in the Bath?

Someone on the internet told you to put salt in your bath, you walked into the kitchen, and now you are holding a blue cylinder of Morton’s wondering if this counts.

Short answer: it is safe, and it is not the same thing. Epsom salt and table salt are two completely different compounds that happen to look alike in a jar. Here is what each one is actually doing in the water, so you can decide whether the kitchen one is worth the trip.

They are not the same salt. They are not even close

Table salt is sodium chloride — sodium plus chlorine. It is the one your body needs a little of, the one on your fries, the one that makes seawater taste like seawater.

Epsom salt is magnesium sulfate — magnesium plus sulfur and oxygen. Different metal, different everything. It is not edible in any normal sense and you should not cook with it.

The only reason both are called “salt” is chemistry’s naming convention: a salt is any compound made of a positive and a negative ion locked into a crystal. Sodium chloride got the common name first, and everything else that crystallized into the same tidy little cubes inherited it. So Epsom salt is a salt the way a whale is a mammal — technically correct, wildly misleading if you were expecting a cow.

That is the whole confusion, and it is worth knowing because the packaging never explains it. If you want the wider version of this — Dead Sea salt, bath soaks, the whole aisle — that lives in Epsom salt vs. bath salts vs. bath soaks.

What table salt actually does in bathwater

Not much, and that is not an insult.

Dissolved salt changes how the water feels against your skin. It goes slightly slick, slightly denser, a little closer to ocean water than tap water. Some people love that feeling. That is real, and it is essentially the entire effect.

What it does not do: it does not add magnesium, because there is no magnesium in it. It does not soften your skin in any lasting way. It does not do the thing the wellness internet claims it does, whatever that thing was this week.

One practical caution. Salt water on broken skin stings — a fresh shave, a scrape, a healing tattoo, a cut you forgot about until you sat down. That applies to any salt bath, but it is the reason a “let’s see what happens” table salt bath sometimes ends with a yelp.

What Epsom salt does differently

Epsom salt brings magnesium and sulfate to the party, dissolves fast, and costs almost nothing. Whether meaningful amounts of magnesium cross your skin is genuinely still debated, and anyone selling you certainty on that is selling something. What is not debated is that a warm 20-minute soak with a couple of cups of Epsom salt in it feels good, feels different from plain water, and has been the default muscle-soak move for about two centuries.

It is also cheaper per bath than table salt, which surprises people. A 5 lb bag runs a few dollars and gives you five or six proper baths. Table salt is priced for sprinkling, not for dumping two cups of it into 40 gallons of water. The honest rundown of what it does and does not do is over in Epsom salt bath benefits.

Mami says: if the question is “can I?”, yes, mija, go ahead. If the question is “should I?”, buy the four-dollar bag. Your pasta water needs the Morton’s more than your tub does.

So can you use table salt? Here is the honest answer

Yes. Use about a cup in a standard tub. It will dissolve, the water will feel nicer, nothing bad will happen to you or your plumbing at that quantity.

But treat it as the backup plan, not the plan. You will use a lot of an expensive-per-pound product to get a mild effect, and you will probably be annoyed when you go to salt your soup on Thursday. If you are doing this because the bag of Epsom salt ran out mid-week, fine — that is exactly what the pantry is for. If you are doing it as your regular ritual, you are paying more for less.

Sea salt and pink salt sit in between

Coarse sea salt and Himalayan pink salt are also mostly sodium chloride, with trace minerals along for the ride. The minerals are real and they are present in tiny amounts; the marketing treats them like a multivitamin, which they are not.

They do feel nicer than table salt — bigger crystals, no anti-caking agents, a more pleasant scoop-and-pour. Dead Sea salt is the genuine exception in this group, because it is unusually high in magnesium and other minerals rather than being sodium chloride with a nice story. If you want a sea salt for the tub, that is the one to spend on.

What to reach for, depending on what is in the house

You have Epsom salt. Use it. One to two cups per standard tub. If you have never measured, how much bath salt to use will probably tell you that you have been using too little.

You have baking soda. Half a cup makes the water feel noticeably softer and costs about a dollar. It is the pantry box that actually earns its place in the bath.

You have table salt and nothing else. One cup, and enjoy it for what it is. If there is anything else in the cupboard — baking soda, sea salt, a bag of oats — the Epsom salt substitute finder will tell you which of them is the better bath and how much to use.

You have all three and you are feeling ambitious. That is the beginning of making your own bath salts — Epsom base, a little baking soda, whatever scent you like.

You have none of the above and are starting from zero. Build the small version first: the bath ritual starter kit is the short list of what is worth owning.

The one-line version

Epsom salt is magnesium sulfate and it is what the bath advice means. Table salt is sodium chloride and it makes water feel slightly silkier. Both are safe, one is cheaper per bath, and only one of them is what you were actually told to buy.

Go run the water. If the only salt in the house is the kitchen one tonight, use it and don’t feel clever or guilty about it — then put Epsom salt on the list, because four dollars is a low price for never wondering about this again.