Malic Acid is the principal acid contained in apples and many other fruits and vegetables. It supports energy production by allowing your body to produce ATP more efficiently, which is essential for proper muscle function. Leading healthcare professionals familiar with Fibromyalgia recommend Malic Acid, combined with Magnesium, for the chronic muscle soreness and fatigue experienced by most patients with this condition. Healthcare providers have found that patients with Fibromyalgia who use a combination of Malic Acid and Magnesium reported improvements in the reduction of muscle Discomfort and tiredness.