Morton Iodized Salt: What’s In It?

What’s in Morton Iodized Salt? There are four ingredients: salt, calcium silicate, sugar, and potassium iodide. Morton uses the sciencey name dextrose for sugar, but dextrose is sugar. The amount of sugar in your salt is too small to trigger sugar cravings, but isn’t it troubling to find sugar showing up in your salt!

Let’s review the ingredients to understand what they are and why they are present.

Salt is a mineral and the world’s most common food seasoning. I add salt to almost everything I cook. Chris Kresser has written about salt extensively lately. Click here for part 1 and part 2 of his series.

The second ingredient is calcium silicate (an anticaking agent). Wikipedia explains, “A white free-flowing powder derived from limestone and diatomaceous earth, calcium silicate has no known adverse effects to health. It is used in roads, insulation, bricks, roof tiles, table salt and occurs in cements, where it is known as belite (or in cement chemist notation C2S).” I get it. Calcium silicate is rock dust and it helps keep salt from forming clumps and helps it flow out of a carton or shaker easily. I’m actually okay with eating a little dirt.

Postassium iodide is the fourth ingredient. According to the Salt Institute, “Modern salt plants routinely spray potassium iodide or potassium iodate onto the salt while it moves along a conveyor belt before it is packaged. In lower-tech operations, iodine is sometimes added as a dry ingredient and physically mixed with the salt (” Morton explains why, “In 1924 Morton became the first company to produce iodized salt for the table in order to reduce the incidence of simple goiter… Iodine is vital to the proper functioning of the thyroid gland and the prevention of goiter ( Iodine is spotty in the food chain. You might get all you need from seafood, sea vegetables, eggs, strawberries, etc., but you might not, especially if you don’t eat these foods very often. Putting iodine into salt is a safety factor.

Dextrose, the third ingredient, is added to keep the potassium iodide from oxidizing and being lost. Dextrose, of course, is sugar. Check the salt in your cabinet at home. If it’s iodized, it almost certainly contains sugar. Morton explains that while it is chemically essential, “the amount of dextrose in salt is so small that it is dietetically insignificant… Morton® Iodized Table Salt contains 0.04 percent dextrose or 40 milligrams per 100 grams of salt.”

Personally, I use salt that is not iodized and does not contain sugar, and make a point of eating seafood, seaweed, and lots of eggs to meet my dietary iodine needs. My approach is not required for excellent health, but I enjoy being an extremist occasionally and this is one of my occasions. How about you?


21 Responses to “Morton Iodized Salt: What’s In It?”

  1. What about Sea Salt? I haven’t looked at the ingredients in mine… Now you’ve got me thinking!

  2. Yuck, table salt is nasty stuff. Great breakdown of ingredients! I stopped buying table salt not long ago as part of my Paleo diet ( and have started eating plain sea salt every morning for my adrenals! A Bulletproof Executive recommendation, and I love it!

  3. I had no idea sugars were in Morton’s salt. I have been buying sea salt or kosher flake salt since starting a W30 in May 2013. I like the flavor better. Now I know another reason not to buy traditional table salt. Thanks for the information!

  4. I’m not crazy about eating anything called an “anti caking agent” that comes from limestone if it doesn’t have nutritional benefit. I stick to pure himalayan pink sea salt. Mineral rich and pollution free. I eat a lot of fish, eggs and sea veggies for my iodine too :).

  5. Coming from a family of diabetics what kind of salt can I buy that does not contain dextrose or sugar or other additives like limestone.

    • Tom Denham says:

      You could buy a good quality of sea salt that is all natural. However, the dextrose in salt is not an issue for diabetics.

  6. What would you suggest for one that is allergic to sugar (and corn products)?

    • Tom Denham says:

      The amount of dextrose in salt is not high enough to trigger issues. However, I take a kelp tablet every day to make sure I get a good supply of iodine and then I cook with sea salt that does not have added iodine.


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