Zym, the portable electrolyte tablet packaged in small pocket-sized tubes, is now available in a new raspberry flavour with added Guarana.

Since the World Anti-Doping Agency (WADA) changed their rules regarding an athlete's use of caffeine, there's been a surge of new products boasting the performance increasing substance. The addition of Guarana provides each tablet with 100mg of Caffeine, which should give you a boost then you're flagging on a hard ride.

One tablet is enough for 500ml of water. Each tube comes filled with 10 tablets and costs £5.99, available from most well-stocked cycling and triathlon shops. Lemon and Lime flavour is also available.

www.gozym.com.