No. 1 pharmacist & pediatrician recommended brand for hydration. AdvancedCare with immune support. Key nutrients for immune support (Nutrients include: Zinc and selenium). Prebiotics to help promote digestive health. Pedialyte is designed to prevent dehydration (for mid to moderate hydration) more effectively than common beverages. Pedialyte AdvancedCare with Immune Support quickly replenishes fluids and electrolytes to help prevent dehydration due to: Vomiting & diarrhea, heat exhaustion, intense exercise, and travel. Pedialyte: Replaces electrolytes; replenishes zinc. Pedialyte AdvancedCare: Replaces electrolytes; replenishes zinc; PreActiv probiotics. Pedialyte AdvancedCare +: Replaces electrolytes; replenishes zinc; PreActiv probiotics; 33% more electrolytes (60 mEq sodium electrolytes per liter vs 45 mEq in original Pedialyte). Designed for fast, effective rehydration.