Salt Types Compared at a Glance: Sea, Himalayan, Celtic, Kosher, Iodized
Sea, Himalayan, Celtic, kosher and iodized salt side by side: all mostly sodium chloride, with iodine the main documented difference and trace minerals too small to matter.
Content last updated . This page has not been medically reviewed.
The short answer: these salts are mostly sodium chloride, so sodium is the main thing to watch, and the trace minerals in "natural" salts are too small to give substantial nutritional benefit. [1][2] The clearest difference we found is iodine, which is added to iodized table salt. [1][3] This page compares the common salts using only what the sources we read say. It does not tell you how much salt to use.
What the question is
Shops sell many salts at very different prices, and labels often suggest that sea, pink or grey salt is healthier. The honest question is: what actually differs between them? We looked at sodium, trace minerals, iodine, contaminants and the few human studies.What the sources say
- Sodium is similar. A UK survey of seven salts (sea, rock, Himalayan and table) found sodium plus chloride between about 91% and 104% of weight, with about 5% measurement uncertainty. The group's conclusion was that they all contain nearly 100% sodium chloride and that mineral claims on packs were unsubstantiated. [2]
- Volume is not weight. Harvard's Nutrition Source lists about 2,120 mg sodium per teaspoon of fine sea salt, 2,200 mg for Himalayan salt and 2,300 mg for fine iodized table salt. Coarse salts hold less per teaspoon because the crystals pack less tightly: about 1,560 mg for coarse sea salt, and for kosher salt 1,920 mg (coarse) or 1,120 mg (fine, one brand). [1]
- Trace minerals are small. Harvard says less processed salts have small amounts of minerals, but "the amount is not enough to offer substantial nutritional benefit." [1]
- Iodine. Iodine was added to table salt in 1924 to prevent goiter and underactive thyroid, and kosher salt typically has none. [1] MedlinePlus calls iodized salt the main food source of iodine, with 78 micrograms in a quarter teaspoon. [3] The sources we read did not measure iodine in sea or Himalayan salt, so check the label.
- Contaminants. An analysis of 10 specialty salts sold in southern Italy found levels varied by type and origin, and lead was above the maximum permitted level in every sample; the authors called for more monitoring. [6] A study of 39 commercial brands found microplastics in all salt types, highest in sea salts. [7] These are single studies of the products tested, not a verdict on every brand.
Side-by-side table
| Salt | What it is, per the sources | Sodium (Harvard, per tsp) | Iodine | Notes |
|---|---|---|---|---|
| Iodized table salt | Very finely ground; iodine added [1] | About 2,300 mg (fine) [1] | Yes, added [1][3] | Heavy processing may remove trace minerals [1] |
| Sea salt | Less refined, may look coarser and darker [1] | About 2,120 mg fine; 1,560 mg coarse [1] | Not described in sources we read | May contain small potassium, zinc, iron; may carry ocean metals such as lead [1]; microplastics found, highest in sea salt [7] |
| Himalayan (pink) salt | Larger crystals; small iron, calcium, potassium, magnesium [1] | About 2,200 mg [1] | Not described in sources we read | One small trial: no difference from table salt in blood pressure (see below) [8] |
| Kosher salt | Coarsely grained [1] | 1,920 mg coarse; 1,120 mg fine (one brand) [1] | Typically none [1] | Name refers to use in koshering; the sources we read give no mineral claims |
| Celtic (grey) salt | Sold as a moist, grey sea salt | Proper evidence not found in the sources we read | Proper evidence not found | Only seller claims were found (for example "rich in magnesium"); we do not repeat them as fact |
Do any of them change health?
Himalayan salt was compared with table salt in a small crossover trial of 17 women with high blood pressure. The authors found no significant difference in blood pressure or urinary sodium. [8] That is one very small study. We found no human trial showing a health benefit from choosing sea, Celtic or kosher salt over table salt. Proper evidence not found.The World Health Organization recommends adults have under 2,000 mg of sodium a day (under 5 g of salt), and says all salt consumed should be iodized. [4] The NHS says adults should have no more than 6 g of salt a day, and that babies under 1 year should have less than 1 g because their kidneys are not fully developed. [5]
Related pages
Frequently asked questions
Is sea salt or Himalayan salt healthier than table salt?
We found no source showing a health benefit. They are nearly all sodium chloride, and trace minerals are not enough for substantial nutritional benefit. [1][2]
Which salt has iodine?
Iodized table salt has iodine added. [1][3] Kosher salt typically has none. [1] The sources we read did not measure iodine in sea or Himalayan salt, so read the label.
Does Celtic grey salt have more magnesium?
Proper evidence not found in the sources we read. Magnesium claims for it come from sellers.
Do specialty salts have less sodium?
By weight, no. By the teaspoon, coarse crystals hold less sodium simply because they pack less salt into the spoon. [1]
Is specialty salt safe for babies?
Babies need very little salt, under 1 g a day for the first year per the NHS. [5] Ask a clinician or health visitor about what to add to a baby's food.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Who should check with a clinician
- People with high blood pressure, heart or kidney disease, or told to limit sodium: any of these salts adds sodium. Ask your clinician; see heart disease, high blood pressure and supplements and kidney disease and supplements.
- People with thyroid disease: very high iodine intake can reduce thyroid function. [3]
- Pregnancy and breastfeeding: iodine needs are higher (MedlinePlus lists 220 and 290 micrograms a day in the US). [3] Ask a clinician; see iodine in pregnancy.
- Babies and young children need much less salt than adults. [5]
- If a child swallows a large amount of any salt, see a child swallowed a supplement or natural product and poisoning: urgent help.
References
- Harvard T.H. Chan School of Public Health, The Nutrition Source. Salt and Sodium. Last reviewed March 2023. Read 2026-10-24.
- Action on Salt (Queen Mary University of London). Gourmet Salt Survey. Survey dated 17 November 2011. Read 2026-10-24.
- MedlinePlus (US National Library of Medicine). Iodine in diet. Review date 1/21/2025. Read 2026-10-24.
- World Health Organization. Sodium reduction (fact sheet). Dated 11 May 2026. Read 2026-10-24.
- NHS (UK). Salt in your diet. Page last reviewed 17 April 2023. Read 2026-10-24.
- Di Salvo E, et al. Gourmet Table Salts: The Mineral Composition Showdown. Toxics 2023;11(8). Abstract read via Europe PMC. Read 2026-10-24.
- Kim JS, et al. Global Pattern of Microplastics in Commercial Food-Grade Salts. Environ Sci Technol 2018. Abstract read via Europe PMC. Read 2026-10-24.
- Loyola IP, et al. Comparison between the Effects of Himalayan Salt and Common Salt Intake on Urinary Sodium and Blood Pressure in Hypertensive Individuals. Arq Bras Cardiol 2022;118(5). Abstract read via Europe PMC. Read 2026-10-24.