Brew

The new GU Brew is about electrolytes first, then carbohydrates. But carbs are key to endurance nutrition so Gu take them seriously. With a 50:50 ratio of fructose (simple) and maltodextrin (complex) carbs because carbs in this combination increase the amount of energy available to muscles.
Simpler is Better
No gimmicky additives here. GU Brew is as simple as they come - with just a handful of key ingredients. Complex and simple carbs in optimal balance, vital electrolytes at the proper levels for intense exercise, and all-natural flavours. This means the product is easy on your stomach and will keep you focused on reaching your goals in training and racing.GU Brew is naturally flavoured with an ultralight taste profile for great drinkability prized by hardworking athletes.

ELECTROLYTES: Maintain water balance and aid in optimum hydration.
CARBOHYDRATES: Deliver ready-to-use energy and delay bonking by sparing glycogen.
CAFFEINE: Enhances performance by increasing focus and concentration and decreasing perceived effort during exercise.