It contains the 4 most important forms of magnesium salts (magnesium citrate, carbonate, oxide and hydroxide), ensuring that with 1 tablet a day, 100% of the Recommended Daily Intake of Magnesium (375mg) is obtained.
The reason for using the 4 most important forms of magnesium salts at the same time is to achieve a high amount of magnesium in a small tablet size, making it an ideal supplement for people who either cannot swallow large tablets, or want the easy way of one tablet daily to absorb 100% of the Recommended Daily Intake of Magnesium.