Sea salt is not meaningfully healthier than regular table salt. Both contain roughly the same amount of sodium, and sodium is the ingredient that matters most for your health. The World Health Organization recommends adults consume less than 2,000 mg of sodium per day (just under a teaspoon of any salt), and sea salt will push you toward that limit just as fast as the table variety. Where the two do differ is in processing, trace minerals, and iodine content, and those differences cut both ways.
Sea Salt and Table Salt Contain Equal Sodium
The core claim behind sea salt marketing is that it’s a lighter, more natural source of sodium. But the American Heart Association states plainly that sea salt has the same amount of sodium as table salt. Gram for gram, both are primarily sodium chloride. If you’re watching your sodium intake to manage blood pressure, switching to sea salt changes nothing.
The one thing that can create a slight practical difference is crystal size. Sea salt often comes in larger, coarser flakes, which means fewer crystals fit in a teaspoon. If you’re measuring by volume rather than weight, you might use slightly less sodium per pinch. But that’s a measuring quirk, not a nutritional advantage. If you use enough sea salt to match the flavor of table salt, you end up in the same place.
The Trace Mineral Argument
Sea salt is produced by evaporating ocean water or saltwater lake water, and it’s less processed than table salt. That minimal processing allows it to retain small amounts of minerals like calcium, along with whatever else the source water contained. Analyses of unrefined sea salts have found calcium levels ranging from roughly 1,860 to 6,250 parts per million, depending on the source.
Those numbers sound impressive until you consider how little salt you actually eat. At a teaspoon or less per day, the amount of calcium or any other trace mineral you’d get from sea salt is nutritionally trivial. You’d need to eat dangerously large quantities of salt before those minerals added up to a meaningful percentage of your daily needs. A single glass of milk or a handful of almonds delivers more calcium than a full day’s worth of sea salt ever could.
Sea Salt Lacks Iodine
This is where sea salt can actually be a disadvantage. Table salt in the U.S. is fortified with iodine, providing about 45 micrograms per gram of salt. The recommended daily intake for adults is 150 micrograms, which you can get from roughly half to three-quarters of a teaspoon of iodized table salt. Unfortified sea salt contains only a small amount of iodine naturally.
Iodine is essential for your thyroid, the gland that regulates metabolism, energy, and growth. Not getting enough can lead to an enlarged thyroid (goiter) or an underactive thyroid. Before iodized salt was introduced in the 1920s, iodine deficiency was so widespread across the Great Lakes, Appalachian, and Pacific Northwest regions that the area was called the “goiter belt.” If you’ve fully switched to sea salt and don’t eat much seafood, dairy, or eggs, you could be getting less iodine than you realize.
Microplastics and Contaminants
Because sea salt comes from evaporated ocean water, it carries whatever the ocean carries. Research has consistently found microplastics in commercial sea salt samples. The most common types are polyethylene, polypropylene, and PET, the same plastics found in packaging, bottles, and synthetic clothing. The dominant form is tiny fibers, usually transparent or white.
Table salt, which is mined from underground deposits, tends to contain fewer microplastics because it hasn’t been exposed to modern ocean pollution. That said, microplastics are now found in drinking water, produce, and air, so salt is only one of many exposure routes.
Heavy metals are a separate concern. A meta-analysis covering 610 salt samples found measurable levels of lead, mercury, arsenic, and cadmium across salt types. Interestingly, rock salt (mined salt) actually showed higher levels of lead and cadmium than sea salt or refined salt. For all types, the health risk from heavy metals at normal salt consumption levels was classified as negligible. You’d need to eat far more salt than anyone recommends before toxic metals became the primary worry.
What Actually Matters for Your Health
The single most important thing about any salt is how much of it you use. The WHO guideline of less than 2,000 mg of sodium per day, equivalent to about 5 grams of salt total, applies regardless of whether that salt is pink Himalayan, gray Celtic, flaky Maldon, or plain iodized table salt. Most people in developed countries exceed this limit significantly, and the excess comes overwhelmingly from processed and restaurant food rather than from what you sprinkle at the table.
If you prefer the taste or texture of sea salt for cooking, there’s no reason to avoid it. But treat it as a flavor preference, not a health upgrade. The practical move for most people is to keep iodized table salt in the rotation to maintain iodine intake, use any salt sparingly, and focus dietary energy on the things that actually shift health outcomes: more vegetables, less ultra-processed food, and consistent physical activity. The type of salt in your cabinet is one of the least consequential nutrition decisions you’ll make.