What the heck is GU? 

GU Energy Gel provides athletes with a dose of 100 calories to deliver high-quality, easily-digested and long-lasting energy for athletes in every sport and at all levels. Everything inside each packet of GU is engineered to do one simple thing: provide your body with the essential nutrition it needs to keep going for miles and miles and hours and hours. It goes down easy, and it goes to work fast so you don't have to slow down.

What's in it?

• Carbohydrates - GU provides athletes with a dose of 100 calories in the form of 70-80% maltodextrin and 30-20% fructose (The ratio depends upon the flavor.). Why the mix? It’s a complex carbohydrate, and studies have shown that some complex carbs are actually digested faster than simple sugars like table sugar and honey.
• Amino Acid Blend - GU features a unique blend of amino acids to combat muscle fatigue, accelerate the conversion of carbohydrates into usable energy, and maintain mental focus.
• Electrolytes - Sodium and potassium to replenish what is lost during strenuous activity.
• Caffeine - Some GU flavors are caffeinated while others are not. We add caffeine for two reasons: It acts as a stimulant and it lowers the perceived effort.