Magnesium Complex . Magnesium is an essential mineral. It is present in more than 300 enzymatic systems where it is crucial for energy production and other metabolic functions. The heart, brain and kidneys cannot function without adequate levels of this nutrient. Magnesium Complex combines two excellent forms of magnesium citrate and malate. Studies show that magnesium citrate and malate are soluble and among the best forms of magnesium. Each capsule provides 100 mg magnesium. Take 2 capsules twice daily with meal.