NutriCology Mastic Gum - 120 Capsules NutriCology Mastic Gum Description: Hypoallergenic. Chios Gum Mastic is the resinous material shown obtained from the Pistacia lenticus tree which is grown in the island of Chios in Greece. Traditionally used as a health food in Greece a recent study reported to the New England Journal of Medicine supports mastic's contribution to gastrointestinal health. Disclaimer These statements have not been evaluated by the FDA. These products are not intended to diagnose treat cure or prevent any disease.