GU Energy Labs Gel Jet Blackberry - Box of 24. It is a box of 24 individual packets of GU Energy Gel in the Jet Blackberry flavor. Each packet contains 100 calories, 21 grams of carbohydrates, and 40 milligrams of caffeine. GU Energy Gel is a popular choice for athletes who need a quick and easy source of energy during exercise. The gel is made with maltodextrin and fructose, which are two types of carbohydrates that are absorbed quickly by the body. It also contains electrolytes, such as sodium and potassium, which help to replenish the electrolytes that are lost through sweat. The Jet Blackberry flavor is one of GU's most popular flavors. It has a sweet and tart taste that is reminiscent of fresh blackberries. GU Energy Gel is a great option for athletes who are looking for a convenient and effective way to fuel their workouts. It is also a good choice for people who are on the go and need a quick and easy way to get some energy.