Cellucor C4 Energy Carbonated

£26.99 (pack of 12), hollandandbarrett.com

Best reserved for when you need a serious lift, C4 Energy contains 160mg caffeine per can, with a little added L-arginine, taurine, betaine, B12 and niacin. There’s 28kcals per 500ml can, zero sugars and no artificial colours or flavourings. Available in four flavours: Frozen Bombsicle, Twisted Lemonade, Cosmic Rainbow, and Orange Slice.