Herbs of Gold Magnesium Citrate 900 provides magnesium citrate, a well-absorbed organic form of magnesium that helps maintain healthy magnesium levels in the body when dietary intake is inadequate. Each capsule provides 145.8mg of elemental magnesium to support healthy muscle contraction, nervous system function and energy production. Magnesium citrate may help relieve muscle cramps, reduce the occurrence of mild migraines, support a healthy stress response and assist with symptoms of premenstrual tension including menstrual cramps and pain. It also supports cardiovascular, bone and muscle health while assisting sugar metabolism and general wellbeing.