Source Naturals, Mastic Gum Extract, 500 mg, 120 CapsProduct Description 500 mg Considered as Dietary Supplement For Stomach Discomfort Product Benefits In clinical human research studies, mastic gum inhibited and reduced over production of foreign organisms in the stomach and duodenum. When digestive flora is imbalanced, mastic gum appears to work on foreign organisms by disrupting their energy production and then rupturing their cells. Some researchers also believe that mastic gum works by stimulating