EnergySource 4:1 is an all-in-one sports drink for use both DURING and AFTER exercise. It contains 4 parts carbohydrate to 1 part whey protein isolate and key electrolytes. 4:1 is the Pros choice for hard training and multi-day endurance events. Use 4:1 when you anticipate a big step up in training intensity or volume, such as a training camp. The ingredients in 4:1 help sustain performance during extended exercise and help maintain hydration by enhancing the absorption of water. Whey Isolate is a high quality source of protein. Protein contributes to the maintenance and growth of muscle mass. This can result in stronger, more resilient muscle. Features: The Pros choice for hard training and multi day racing High quality protein contributes to the maintenance and growth of muscle mass* Carbohydrates with electrolytes for endurance performance* Helps maintain hydration during exercise* The carbohydrate content of 4:1 is 2:1 fructose Light tasting and refreshing Proven in the Worlds toughest endurance events With natural flavours. No artificial colours, preservatives or sweeteners No lactose as an ingredient. Suitable for vegetarians. *Effect of the ingredients.