5 key electrolytes for fast rehydration; muscle support. No 1 doctor recommended brand for hydration. Supplies 5 key electrolytes to hep replace what's lost in sweat. Sodium (Na): To avoid muscle cramps. Chloride (CI): For fluid balance. Potassium (K): For muscle & nerve function. Magnesium (Mg): For muscle health. Phosphate (P): For muscle repair. From the brand used by professional sports teams for decades. Rapidly rehydrate with advance science. One Liter of Pedialyte Sport Provides: sodium, 60 meq: potassium, 33 meg; chloride, 55 meq. No fruit juice.