Fibralgia™ [Structural] is good news for millions of Americans who suffer from chronic muscle soreness, stiffness and fatigue. When the body becomes deficient in energy-producing fuel, it breaks down muscle protein to create energy. This process can cause pain, fatigue and other problems. Researchers have found that many people with this type of discomfort respond to supplements containing malic acid and magnesium, the ingredients in NSP Fibralgia. Malic acid, found naturally in high concentrations in apples and other fruits and vegetables, provides magnesium, which plays in important role in producing energy for the cells. Magnesium is used daily to help with the absorption of several vitamins and minerals, to promote bone strength and to regulate nerve impulses.