A biker puts an energy gel under his shorts prior to the start of the 17th stage of the Tour de France in 2013. (Christophe Ena/AP) “Mmmm,” Amy Cragg, a marathoner competing in the Rio ...

With more than two dozen flavors, GU Energy has an energy gel for everyone. Take a look inside the making (and ingredients) inside the company's newest flavor, chai latte.

There are a lot of obscure ingredients in Gu gels. Here's what they actually do for you. ... a gooey fuel like Gu's Roctane Energy Gel might be an easy option. (Photo: Matt Trappe/Gu) ...

GU Energy GU Energy Gel, 24-Count. $39 at Amazon. A wide variety of flavors keeps your palette happy. Honey Stinger Organic Fruit Smoothie Energy Gel . Now 15% Off. $34 $29 at Amazon.

Berkeley, CA – GU Energy Gel is proud to announce that Olympic Marathoner Magdalena Lewy Boulet has entered a long-term sponsorship contract with GU as her exclusive energy gel and sports drink ...

At mile 5, I go with the caffeine-free Toasted Marshmallow, Campfire S’mores or Peanut Butter GU energy gels. Then at mile 10, I want a 20 mg. caffeine boost with the Salted Caramel, Chocolate ...