Pure Encapsulations Muscle Cramp/Tension Formula 60 Veggie CapsMuscle Cramp Tension Formula Electrolyte and herbal combination Muscle Cramp Tension Formula offers important electrolytes to assist in maintaining proper muscle function as well as soothing herbs to promote overall calmness. The electrolytes magnesium, calcium and potassium are important for maintaining healthy muscle contractile function. In several trials, magnesium contributed to leg muscle function by aiding in lessening occasional nighttime