To aid me in my running programme, I have recently purchased Lucozade Body Fuel, I bought a case of 12 for £9.18
'It is formulated to tackle the reduction of carbohydrate stores and maintain hydration to improve performance in prolonged exercise or sport. Studies testing endurance athletes, such as marathon or long distance runners, have proven that the running speed is higher over the course of an event among those drinking Lucozade Sport, compared to those solely drinking water.' (Lucozadeshop.com)
I have only had a few, but so far I genuinely do think that they are helping. I currently go for a 45minute run 3-5 times a week. Next week I hope top run further for longer getting my time up to 55 minutes.
To get your Lucozade Body Fuel click here http://www.lucozadeshop.com/body-fuel-runners/03597.html