Science in Sport Beta Fuel 80

£37.50 (15 sachets), scienceinsport.com

Tried-and-trusted brand Science in Sport has worked closely with elite athletes to develop the new Beta Fuel range, made specifically for endurance exercise (two hours or more). The range includes this dual-fuel energy drink, which has been formulated with carb sources maltodextrin and fructose to deliver 80g of carbohydrate per sachet.