Konoshima Chemical

For more than 30 years, Konoshima has been a partner of Stauber’s supplying the premier raw materials of Magnesium Oxide, Magnesium Carbonate and Magnesium Hydroxide. Konoshima is a superior-quality mineral manufacturer located on the coast of Japan.



Konoshima’s STARMAG Magnesium Oxide is a high purity magnesium that is extracted from seawater. Several grades of STARMAG are available with varying levels of moisture content, bulk density, Magnesium Oxide content and loss on ignition. Primarily used in dietary supplements for the use of mineral fortification.


A seawater-derived, high purity Magnesium Carbonate created using their proprietary process. Konoshima offers a low bulk density grade as well as a granular version. Magnesium Carbonate is commonly used for mineral fortification in various dietary supplements.


Konoshima manufactures a high purity product that is produced directly from seawater. They offer a powder which is a pharmaceutical grade product as well as a granular material with excellent flowability. For use in dietary supplements supporting mineral fortification.

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