What Is Magnesium? Magnesium is an essential mineral involved in over 300 biochemical reactions in the body. It plays a major role in muscle and nerve function, energy production, blood sugar regulation, stress response, sleep, and overall nervous system health. Although magnesium is naturally found in foods like leafy greens, nuts, seeds, legumes, and dark chocolate, many people still do not meet optimal intake levels through diet alone. Trusted Magnesium Brands These are br