0 sugar per can. Zero sugar. Monster energy ultra fiesta is low in calories. Caffeine from All Sources: 110 mg per 12 fl. oz. serving (225 mg per can) Sleep later, cause tonight we're going to flesta like there's no manana! Ultra fiesta celebrates the nights that turn into mornings and the friends we now call familia. Zero sugar ultra flesta blends juicy mango flavor into the ultra we love finished-off with a full load of our monster energy blend. Ide nada! Unleash the ultra best! monsterenergy.com.