Zero the new great tasting electrolyte drink from high5 now comes with a caffeine kick 65mg about the same as a mild cup of coffee its virtually calorie free 14 calories per 100 ml and is designed for optimal hydration both during and after exercise and to provide a stimulant boost when you are flagging to help focus and concentration zero xtreme is also a great way to get hydrated and give you a boost before a session when you are tired and dont feel up to itzero xtreme is easy t