0 sugar per can. Zero sugar. Monster Energy is low in calories. Monster Energy Blend: Taurine, L-Carnitine, Caffeine, Inositol. Caffeine from all sources: 150 mg per can. Zero sugar + L-carnitine + Taurine. Sleep later, cause tonight we're going to fiesta like there's no manana! Ultra Fiesta celebrates the nights that turn into mornings and the friends we now call familia. Zero sugar Ultra Fiesta Blends Juicy mango flavor into the ultra we love finished-off with a full load of our Monster Energy blend. De nada! Unleash the Ultra Beast. monsterenergy.com.