You want to increase your concentration and endurance performance without consuming sugar or carbohydrates? Then you should try the PowerBar Caffeine Boost. It offers 200 mg of caffeine in a convenient ampoule and combines caffeine from different sources such as mate tea and guarana extract. With just 0,6 g of sugar per ampoule, it’s also perfect for training sessions where you want to do without consuming carbohydrates. Try the caffeine kick that many athletes rely on in training and competition.