Are you getting enough magnesium in your diet? If not, don’t worry, because we’ve got Swanson Super-Strength Magnesium Citrate. What is magnesium? Magnesium is an essential mineral and can be found in abundance in seeds, whole grains, dark green leafy vegetables and some types of fish. Magnesium is important because it plays a key role in the basic cellular function of the heart and nervous system, offering cardiovascular support and promoting healthy blood pressure levels. Magnesium is also the catalyst for enzyme reactions that create energy. Magnesium has long been popular for its soothing properties. Studies now suggest a link between magnesium and stress. Intakes of 300-500 mg per day may help promote healthy levels of cortisol, the stress hormone, by influencing the activity of the hypothalamic-pituitary axis.