Containing 87% to 91% water, milk naturally provides electrolytes, sodium, potassium, calcium and magnesium, which support fluid balance and enhance water retention. Its carbohydrates and high-quality protein also aid muscle recovery during and after exercise, making milk and milk‑based beverages particularly valuable for GLP‑1 users seeking high‑quality complete protein alongside hydration. A 2020 study in Nutrients on the "Hydration Efficacy of a Milk Permeate-Based Oral Hydration Solution" (https://doi.org/10.3390/nu12051502) demonstrated that a milk permeate-based hydration solution improved fluid retention, reduced cumulative urine output, and maintained positive fluid balance longer than water or a traditional carbohydrate‑electrolyte sports drink. "Milk has long been recognized as an excellent hydration beverage because it naturally provides water, electrolytes and high-quality protein. For people who prefer a lighter option during or after exercise, milk permeate-based beverages offer the naturally occurring electrolytes from dairy in a clear beverage, and emerging research continues to demonstrate their effectiveness for rehydration."