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Epsom salt and Celtic salt look alike but do very different jobs. Epsom salt is magnesium sulphate. Celtic salt is a mineral-rich sea salt. That one difference changes how each affects the body, how fast it dissolves, how it tastes and where you should use it. If you're comparing the two, you probably want to know which belongs in the bath, in your water, on your skin or in your cooking. This guide sets it out so you can pick the right one.
What is Epsom salt and how does it work?
Epsom salt is a natural magnesium sulphate salt. It forms when mineral water evaporates and leaves clear crystals behind. Those crystals dissolve quickly in warm water, which is why Epsom salt is used for muscle recovery, softening skin, magnesium baths and foot soaks.
It doesn't behave like table salt because it contains no sodium. The magnesium supports muscle and nerve function. When you dissolve Epsom salt in warm water and soak in it, the solution works on the surface of your skin and has a gentle, relaxing effect.
People often use Epsom salt baths to ease tight legs, heavy feet and tired muscles after training. The warm water and magnesium sulphate loosen stiff areas without any scrubbing.
It also softens rough skin. After a short soak, dry patches come away more easily, and mixed with natural oils it makes a smooth exfoliating scrub. Some people even add a little to their conditioner to help clear product build-up from their hair.
What is Celtic salt and why is it popular for cooking?
Celtic salt, often called Celtic sea salt, comes from shallow seawater pools on the French coast. It forms naturally as the seawater dries in the sun. Because the water dries slowly, this unrefined sea salt keeps its natural minerals. The grey colour comes from the clay under the salt beds, which leaves tiny mineral traces in the crystals.
Celtic salt is mostly sodium chloride, with small amounts of magnesium, potassium, calcium and iron. These are trace amounts, so it isn't a meaningful source of minerals in your diet, but they give it a rounder flavour than refined salt.
In cooking, Celtic salt melts slowly and clings well to food. It has a clean, smooth taste that suits soups, vegetables, eggs, grilled meat and salads. Many people prefer it to refined salt because it keeps its natural minerals.
Also read: 6 Surprising Benefits of Celtic Sea Salt for Your Cooking
How do Epsom salt and Celtic salt form?
How each salt forms explains why they behave so differently.
How Epsom salt forms
Epsom salt comes from mineral-rich basins. As the water evaporates, magnesium sulphate crystals appear. They dissolve quickly in hot water, which makes Epsom salt ideal as a bath salt for sore muscles and for skin soaks.
How Celtic salt forms
Celtic salt forms in clay-lined seawater beds. Sun and wind dry the water slowly and leave mineral-rich sea salt behind. The moisture left in the crystals is natural seawater, which gives Celtic salt its soft texture and grey colour.
The way each salt forms affects its taste, how fast it dissolves, its mineral content and what it's best for.
How does Epsom salt help skin and muscles?
Epsom salt helps you relax because the magnesium in warm water works on the surface of your skin. That makes it useful for:
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Muscle recovery after exercise
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Reducing swelling in feet and ankles
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Softening rough skin on heels and elbows
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Easing tired legs after long hours on your feet
Make sure the salt has fully dissolved in the warm water. For sore muscles, two or three Epsom salt baths a week is plenty. If it's just to relax, once a week is enough.
It's also good for minor skin build-up. A warm foot soak with Epsom salt loosens dead skin, which makes it easier to deal with.
Also read: How Much Epsom Salt for a Bathtub? A Complete Guide
How is Celtic salt used in drinks and meals?
When you sweat, you lose sodium as well as water, which is why some people add a little salt to their water after hard exercise or on a hot day. Celtic salt works for this the same way any salt does. Keep it to a small pinch: most of us already get plenty of salt from food, and the NHS recommends adults have no more than 6g a day.
In food, Celtic salt has a soft flavour that goes with most dishes. Its natural moisture helps it cling to food better than dry salt, so it seasons roast vegetables, grilled chicken, eggs and broths more evenly.
How do their textures affect how you use them?
Epsom salt
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Clear crystals
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Dissolves quickly
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Best for baths and muscle soaks
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Works as a gentle scrub
Celtic salt
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Light grey crystals
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Slightly damp
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Dissolves slowly
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Best for flavour and seasoning
You can tell them apart by texture alone, without tasting them.
Why you shouldn't swap one for the other
Their mineral make-up is different, so they behave differently.
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Epsom salt works on the body through warm water.
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Celtic salt is for flavour and cooking.
Celtic salt in the bath won't give you the magnesium soak that Epsom salt does.
Epsom salt in food tastes bitter, because magnesium sulphate isn't meant for cooking.
Use each one for its own job and you'll get the best from both.
When should you choose Epsom salt?
Choose Epsom salt when you want comfort or muscle relief.
For example:
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After the gym
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After a long walk
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When your feet feel heavy
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When your legs feel tight
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When your skin feels dry or rough
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When you want a relaxing magnesium soak
It's a staple of wellness and personal care routines because it dissolves fast and works well in warm water.
When should you choose Celtic salt?
Choose Celtic salt for cooking and seasoning.
It's the one to use when:
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You want a pinch of salt in your water after a sweaty workout
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You want a clean-tasting seasoning
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You want an unrefined sea salt for everyday meals
It's first and foremost a kitchen salt.
How to store Epsom salt and Celtic salt
Both keep for a long time if stored properly.
Storing Epsom salt
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Keep it in an airtight container
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Store it somewhere dry
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Keep it away from running water
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Clumps don't affect quality
Storing Celtic salt
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Store it in a jar
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Keep it out of direct sunlight
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Clumping is normal because of its natural moisture
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Shake the jar to loosen the crystals
Neither salt goes off easily.
Choosing between Epsom salt and Celtic salt
Choose Epsom salt for:
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Muscle relaxation
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Comfort after workouts
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Foot soaks
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Softening skin
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A magnesium sulphate bath
Choose Celtic salt for:
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Unrefined seasoning
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A pinch in water after exercise
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A clean-tasting cooking salt
They do different jobs, and plenty of people keep both at home.
Final thoughts
Epsom salt works through warm water and magnesium. Celtic salt is about flavour in the kitchen. Once you know the difference, it's easy to use each one properly.
If you're looking for good salts for the bath or the kitchen, SAHZ sells both Epsom and Celtic salt. Have a look at the collection and pick the one that suits your routine.
FAQs
Is Epsom salt the same as Celtic salt?
No. Epsom salt is magnesium sulphate and is mainly used for baths, foot soaks and skin. Celtic salt is unrefined sea salt made of sodium chloride and natural minerals, and it's used for cooking and seasoning. What they're made of, how they taste and what they're for are completely different.
Is Celtic salt full of magnesium?
It contains magnesium, but it isn't a high-magnesium salt. It's mainly sodium chloride, with smaller amounts of magnesium, potassium and calcium. The amounts are small, so it isn't a significant source of magnesium.
What is another name for Celtic salt?
It's also called Celtic sea salt and sel gris, the French name for this natural grey sea salt. The colour comes from the clay-lined beds where it dries. All of these names mean the same unrefined, mineral-rich sea salt from the French coast.
What is the main difference between Epsom salt and Celtic salt?
What they're made of. Epsom salt is magnesium sulphate, while Celtic salt is a mineral-rich sea salt made from seawater. Epsom salt dissolves quickly and is used for muscles and skin soaks. Celtic salt is used for cooking and seasoning.
Can I use Epsom salt and Celtic salt for the same things?
No. Epsom salt is for warm baths and foot soaks, where its magnesium helps you relax. Celtic salt is for cooking and seasoning. Swapping one for the other changes the result and can spoil the taste.
Is Epsom salt safe to eat?
Epsom salt isn't recommended for cooking because magnesium sulphate tastes bitter. It's meant for baths, skin soaks and relaxation. For food, use a cooking salt such as Celtic salt instead.
Should I add Celtic salt to my water?
You can add a small pinch after heavy sweating, as you could with any salt. Most people already get enough salt from food, so it isn't needed day to day. The NHS recommends adults have no more than 6g of salt a day.
How does Epsom salt help muscles and skin?
Epsom salt dissolves quickly in warm water, and the magnesium in it helps ease tightness, settle heavy legs and soften rough skin. A short soak loosens dry patches on heels and elbows. Many people use it after workouts or long days on their feet.
