SWITCH ON Black Edition is the ultimate Zero Sugar, mind-boosting energy supplement that can be taken throughout the day to boost productivity, physical performance, energy and focus. NO CRASH. NO JITTERS. GREAT TASTE. Just like with our award-winning Caffeine Free Brain Fuel SWITCH ON Black Edition also contains research backed ingredients to increase brain functions, like memory, creativity, mood and motivation, whilst reducing anxiety; but this time with added Synergistic Stimulants such as PurCaf (Natural Caffeine) for that added energy boost!