Monster Mango Loco, 16 OZ Juice Monster Mango Loco, Energy Drink Energy + Juice UNLEASH THE BEAST | On the eve of October 31st each year friends and family gather to celebrate “Dia de Los Muertos.” Marigolds, mysticism, and memories combined with food and drink entice the sounds of the departed to join the party. ENERGY + JUICE | Mango Loco is a heavenly blend of exotic juices certain to attract even the most stubborn spirit. Crazy good taste with just enough of that Monster magic to keep the party going for days! Mango Loco Juice Monster delivers 152mgs of Caffeine, and 230 calories per can. Carbonated.