Ultima Replenisher

At $0.50 per serving, Ultima Replenisher is the cheapest electrolyte powder on this list, undercutting Cure Hydration's $1.45 per serving by 65%. Its 100 mg of magnesium per serving matches Cure's magnesium level at less than half the price, supporting muscle relaxation and nerve function during summer heat. With 17 flavors — the widest selection here — and Non-GMO Project Verification, it appeals to clean-label users without breaking the budget. Potassium sits at 250 mg per serving, a moderate amount. This powder functions as a daily wellness enhancer for light-activity individuals, not a rehydration tool for endurance sports. For office workers seeking to improve plain water with 100 mg of magnesium at just $0.50 per serving, Ultima delivers unmatched value.