ElectroMag Effervescent Drink Mix with 150mg Magnesium Bis-Glycinate. Each serving contains 150mg of magnesium from magnesium bis-glycinate a chelated form of magnesium with some of the highest levels of absorption and bioavailability. Unlike other forms of magnesium bis-glycinate doesn't react in the stomach making it easier on the bowels and easier to absorb. We also included a little extra boost of vitamin C and electrolytes for some added antioxidants and support for an active lifestyle.