Nature’s Bounty Magnesium 500mg is a high-potency dietary supplement designed to support bone strength, muscle function, nerve health, and overall wellness.  It aids in muscle contractions and relaxation, helping to prevent cramps and support overall muscle health. As a component in over 200 enzymes, magnesium is vital for energy production and protein formation. May Aid Sleep and Relaxation Higher doses of magnesium have been associated with promoting relaxation and supporting healthy sleep patterns.