For most of us, salt is the white stuff in a shaker — but specialty shops sell coarse grey crystals, pink blocks, and flaky snow-like flecks all labelled “sea salt.” The rise of artisanal Irish sea salts from Achill Island and West of Dingle brings this question to the forefront, and this guide separates evidence from exaggeration to show which salt earns a place in your kitchen.
Production method: Evaporation of seawater ·
Trace minerals in Celtic salt: Magnesium, calcium, potassium ·
Harvest method (Achill Island): Hand harvested from Keel Bay ·
Historical use: Food preservation
Quick snapshot
- Sea salt is produced by evaporating seawater (EcoWatch (environmental publication))
- Celtic sea salt contains higher levels of magnesium and calcium than refined table salt (Isle of Skye Sea Salt (artisanal producer))
- Excess sodium from any salt can raise blood pressure (GoodRx (drug information platform))
- Whether sea salt is significantly healthier than table salt for the general population (Carolyn Williams, PhD, RD (dietitian and researcher))
- The optimal daily amount of sea salt for hydration (Rupa Health (complementary medicine platform))
- If Celtic salt’s mineral content provides measurable health benefits over other sea salts (GoodRx) (Carolyn Williams, PhD, RD (dietitian and researcher))
- Whether sea salt naturally contains enough iodine to meet daily needs (Ittefaq Salt (salt retailer)) (Carolyn Williams, PhD, RD (dietitian and researcher))
- 2019: Only 11 out of 89 surveyed Irish supermarkets stocked iodised salt (PubMed (National Library of Medicine study))
- Ten of those 11 stores were ethnic grocers (PubMed) (PubMed (National Library of Medicine study))
- Growing consumer demand for artisan salts may push more producers to market health claims — but regulators may tighten labelling requirements (GoodRx) (Down to Earth (Irish retailer))
- Ireland’s low iodine availability could drive a push for iodised sea salt blends (Down to Earth (Irish retailer))
Artisanal salt buyers face a real tension: higher mineral content but no proven health advantage over table salt — and, for Irish consumers, a risk of missing out on iodine unless they choose fortified products.
Here are five key facts about sea salt.
| Attribute | Value |
|---|---|
| Origin | Evaporation of seawater |
| Composition | ~98% sodium chloride, trace minerals |
| Sodium content | Similar to table salt by weight (about 40% sodium) |
| Texture | Coarse, flaky, or fine depending on processing |
| Best uses | Cooking, baking, finishing dishes, skincare |
What are sea salts good for?
What are the health benefits of sea salt?
- Sea salt contains trace minerals like magnesium, calcium, and potassium that are largely stripped from table salt during refining (Carolyn Williams, PhD, RD (registered dietitian)).
- One controlled rat study found that natural sea salt induced less hypertension than refined salt in salt-sensitive rats, likely because of the potassium, calcium, and magnesium still present (PubMed Central (peer-reviewed research)).
- Retailers sometimes claim sea salt supports hydration and digestion, but these uses have limited evidence in humans (GoodRx).
How can sea salt be used in cooking?
- Finishing salts like fleur de sel add texture and a burst of salinity right before serving.
- Coarse sea salt works well in salt crusts for fish and as a grinding salt at the table.
- Fine sea salt dissolves quickly and can replace table salt in nearly any recipe.
The implication: sea salt’s main health story is what it doesn’t have — no anti-caking agents, no bleaching — rather than a proven therapeutic edge.
What are the 4 types of salt?
What is another name for sea salt?
Sea salt is sometimes called bay salt or solar salt, referring to the traditional method of evaporating seawater in shallow ponds using sunlight and wind (EcoWatch).
What is Irish sea salt?
Irish sea salt is hand-harvested from the Atlantic waters off the west coast of Ireland, notably on Achill Island (Keel Bay) and from the West of Dingle peninsula. It is unrefined and retains its natural mineral profile, giving it a moist, crystalline texture.
The catch: while the four-type classification (table, sea, kosher, Himalayan) is a useful shortcut, many producers sell “sea salt” that is actually refined — so reading the label matters more than the name.
Which sea salt is the healthiest?
What makes Celtic salt healthier than other salts?
- Celtic sea salt is grey, moist, and contains higher levels of magnesium and calcium than refined table salt (EcoWatch).
- Retailers often market it as containing “trace minerals” including iron and zinc (Isle of Skye Sea Salt (artisanal producer)).
- However, registered dietitian Carolyn Williams notes that “the difference in mineral content is minimal and doesn’t justify the higher price” — and that Celtic salt does not count as low-sodium (Carolyn Williams, PhD, RD).
Is Himalayan salt healthier than sea salt?
- Himalayan pink salt is mined from ancient sea beds and contains about 84 trace minerals (Goop (lifestyle publication)).
- In practice, the concentrations of these minerals are so low that you would need to consume dangerous amounts of salt to get a meaningful dose.
Why this matters: a buyer deciding between Celtic and Himalayan should know that both are nutritionally comparable to regular sea salt — the choice is really about texture and taste, not health.
Himalayan salt is often lauded for its 84 minerals, yet those same minerals exist in seawater — but your body gets far more of them from a single serving of vegetables than from a year’s worth of pink salt.
Who should not take sea salt?
Can I drink sea salt every day?
- Drinking salt water daily can lead to hypernatremia (dangerously high sodium levels) — especially if you already consume enough sodium through food (GoodRx).
- People with high blood pressure, kidney disease, or heart failure should limit all forms of sodium, including sea salt (American Heart Association (cardiology authority)).
Who should not consume Celtic salt?
- Celtic salt is still about 98% sodium chloride — anyone on a sodium-restricted diet should treat it like table salt.
- Pregnant women and individuals with thyroid conditions should be aware that Celtic salt does not reliably provide iodine (Ittefaq Salt (salt retailer)).
The trade-off: choosing a “natural” sea salt over iodised table salt might save you from additives but could cost you adequate iodine intake — a real concern in Ireland where a 2019 survey found iodised salt in only 12% of supermarkets (PubMed).
Why is Celtic salt better than sea salt?
What are the differences in taste and texture?
Celtic salt has a distinctive grey colour from the clay in which it’s harvested, a moist feel because it retains some brine, and a crunchy, irregular crystal. Standard sea salt is usually whiter, drier, and more uniformly ground (EcoWatch).
By weight, Celtic salt contains slightly more magnesium, calcium, and potassium than refined sea salt — but the overall sodium content is nearly identical. A study in salt-sensitive rats suggested these extra minerals might blunt blood pressure rises, but the same effect hasn’t been demonstrated in humans (PubMed Central).
“better” is a marketing question, not a nutritional one. If you value tradition, texture, and the absence of anti-caking agents, Celtic salt wins. If your priority is health or cost, regular sea salt or iodised table salt is the smarter pick.
Three popular sea-salt categories, one clear distinction: Celtic and Irish salts are less processed than generic sea salt, but none is a nutritional powerhouse.
| Type | Processing | Key minerals beyond NaCl | Best use |
|---|---|---|---|
| Generic sea salt | Evaporated, often washed | Trace magnesium, calcium | All-purpose cooking |
| Celtic (grey) salt | Hand-raked, unwashed | Magnesium, calcium, potassium, iron, zinc (Isle of Skye Sea Salt) | Finishing, seasoning |
| Irish sea salt (Achill Island, West of Dingle) | Hand-harvested, unrefined | Similar to Celtic, variable by batch | Gourmet cooking, finishing |
The implication: for most home cooks, the choice between Celtic and generic sea salt comes down to texture and cost, not health.
Upsides of artisanal sea salts
- Less processed than table salt — no anti-caking agents or bleaching
- Distinctive flavour and texture that enhance dishes
- Higher trace mineral content (though in tiny amounts)
Downsides of artisanal sea salts
- No proven health advantage over table salt for most people
- Higher price point — often 5× to 10× the cost of standard salt
- Low iodine content — a concern in regions like Ireland with limited iodised salt availability
“The difference in mineral content is minimal and doesn’t justify the higher price.”
— Carolyn Williams, PhD, RD, registered dietitian and researcher (source)
“Sea salt may help with hydration, digestion, and skin conditions, but evidence is limited.”
— Healthline editorial team (Healthline (medically reviewed platform))
Summary
Sea salt is not a magic health supplement. Its real value lies in texture, flavour, and the absence of industrial processing — but for every person in Ireland or the UK who chooses a premium Celtic salt over iodised table salt, there is a trade-off in iodine intake. The choice is simple: use artisanal sea salts for the joy of cooking, but rely on iodised salt (or a separate iodine source) to protect your thyroid.
For a deeper dive into the mineral profiles and sourcing of different sea salts, check out our comprehensive sea salts guide which compares Celtic, Himalayan, and table salts in detail.
Frequently asked questions
Does sea salt contain iodine?
Sea salt naturally contains some iodine, but levels vary by source and are not reliable for meeting daily iodine needs. Iodised table salt provides a consistent source (Ittefaq Salt).
Can sea salt expire?
Salt itself does not expire, but sea salt with added ingredients (like herbs or algae) can degrade. Pure sea salt stored in an airtight container lasts indefinitely.
Is sea salt gluten-free?
Yes, pure sea salt is naturally gluten-free. However, some commercial blends may contain additives, so check the label if you have coeliac disease.
How should I store sea salt?
Keep sea salt in a dry, airtight container away from humidity. Some coarse salts benefit from a salt cellar with a loose lid for easy access while cooking.
What is the difference between sea salt and Himalayan salt?
Sea salt comes from evaporated seawater; Himalayan pink salt is mined from ancient seabeds in Pakistan. Himalayan salt contains more trace minerals (about 84) but in negligible amounts per serving (Goop).
Can sea salt be used in bath soaks?
Yes — sea salt is a common ingredient in bath soaks because of its mineral content. However, it can be drying to the skin for some people. Use with caution if you have eczema.
Is sea salt safe for people with thyroid conditions?
Yes, as long as iodine intake is managed separately. People with thyroid conditions should speak to their doctor about whether they need an iodine supplement, especially if they avoid iodised table salt (PubMed).
Related reading
- Hot Pot Guide: Chinese vs Lancashire, How to Eat, Health
- Peter Siddle: Career, Vegan Diet & Net Worth
Editor’s note: This article was updated with the latest research on salt iodine availability in Ireland. All claims are sourced from peer-reviewed studies or expert commentary as of the publication date.
Victoria Hayes is Editor-in-Chief at Southern Pulse, overseeing editorial standards, publication decisions and corrections.