GU

Your window of recovery is small—a bottle of GU Recovery Brew takes 30 seconds to make and 30 seconds to drink. It supplies your starved muscles with a heavy dose of carbohydrate and easy-to-absorb whey protein isolate. Consuming such a recovery drink within 30 minutes of workouts/races has shown to drastically improve recovery. Plus, GU added the amino acids L-glutamine and L-arginine for extra muscle and immune system support.