What is the L-Drink for and what is it made of? 20 February 2023 16:50 Updated The L-Drink contains purified water, vegetable glycerine, and natural flavours, and it is intended to support hydration. Related articles Can I drink sparkling water or distilled water? How can people of different sizes and weight eat the same things with the same amount of calories while on the program? How much water should I drink during ProLon® 5-day? Can I add herbs, spices or salt to the soups? What does ProLon® 5-day® contain?