Energy Source 2:1 Xtreme contains 2:1 fructose & a high caffeine content (150mg per 500ml of drink). It is intended to be used as a one-time caffeine hit: a mental kick before or during a hard session, to caffeine load before or during a race & as a "get you home" re-energizer if you bonk on the bike. To benefit from 2:1 fructose drinks & caffeine you must use High 5 products correctly.