From the Manufacturer's Label:
ConcenTrace® Trace Mineral Drops is a natural mineral concentrate that is so concentrated that 40 drops (½ teaspoon) equals the mineral content of ½ cup sea water with 99% sodium removed. You may expect a wide spectrum of nutritional benefits. For regular or sodium restricted diets.
Manufactured by Trace Minerals.Allergen Info: Contains no added preservatives, flavors, or sweeteners. Contains no known allergens. Gluten Free.