NOS Energy Drink is an energy drink sometimes distributed in a bottle designed to look like a NOS (Nitrous Oxide Systems) cartridge. It is produced by Monster Brands and licensed by Holley Performance, which owns the trademark. NOS is available in 8 and 16 ounce aluminum cans, 11 and 22 ounce resealable bottle forms and as a 2 ounce "Powershot." The original version is flavored with juice, but other variants including "fruit punch" and "grape" are also available.