Disclosed is a method of preventing or treating a condition of the gastrointestinal tract. The method includes the steps of providing a DNA repair composition, the DNA repair composition comprising at least one DNA repair enzyme, the DNA repair composition configured for administration within the gastrointestinal tract of a patient; and administering the DNA repair composition to the patient, such that the DNA repair composition is absorbed within the gastrointestinal tract of the patient to treat the condition of the gastrointestinal tract.