GU Energy Gel

Simple to take, simple to digest, GU Energy Gel provides just what you need for premium exercise fuel and none of the extras that slow you down. GU takes you where you want to go, fast.
Launched in 1991, the world’s first energy gel is still the most efficient sports fuel available today. GU’s carbohydrate blend delivers high-quality, easily-digested and long-lasting energy for athletes in every sport and at all levels.

Sorry Need4Speed no longer stock GU Energy Gels

Another alternative is
Carbo Shotz Energy Gels or PowerBar Energy Gels