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Oxy-chew is an invention of Gyro Gearloose. It is a black licorice-flavored chewing gum that people can chew practically indefinitely for survival, continuously supplying them with the oxygen, water, and nutrients they need to survive.
Della Duck chews Oxy-chew to survive on the moon without a space suit
After crashing on the Moon due to his bad luck, Donald Duck downs a pack of Oxy-Chew to survive.