Help take your performance to the next level with ESSENTIAL AMIN.O. ENERGY + ELECTROLYTES from Optimum Nutrition. This refreshing sugar-free drink, available in a variety of tasty flavours, will top up your amino acids and give you an added energy boost before exercise or help you rehydrate during and after training. ESSENTIAL AMIN.O. ENERGY + ELECTROLYTES is packed with 5g of amino acids and 100mg of caffeine from green tea and green coffee to increase alertness and focus.