Powerbar caffeine boost 25ml x 20many athletes such as ironman sebastian kienle trust the benefits of caffeine in their training and competition low doses can give you a mental push and with higher doses of 3 4mg per kg of body weight you can even increase your endurance performance powerbar caffeine boost delivers this necessary active dose of 200mg caffeine for 70kg body weight in an easy single serve shot and combines multiple caffeine sources such as mate tea and guarana extracts with