No impurities. It is easily soluble in hot water and slightly soluble in ethanol.
It is a good organic magnesium enhancer. It is digested into magnesium and glucose acid in vivo, which involves all of the energy metabolism and activates more than 300 enzyme systems. So it could be easily digested and absorbed in the body.
It is widely used in food, drinks, dairy products, flour, nutrition, medicine, etc.