Magnesium is crucial to the body, enabling it to work as a complete system. It enables every cell to function properly. It has the ability to maintain its own balance within the body. Magnesium works on many levels: as an antioxidant, protecting molecules from free radical damage; allowing blood to flow freely and efficiently from the heart; delivering oxygen and nutrients to all the body’s cells. Magnesium is a component of dopamine, the neurotransmitter which helps calm the brain, hence magnesium’s effect on the nervous system. Spinach and Swiss chard have high amounts of magnesium; other dietary sources include halibut and salmon, and a variety of seeds.