Dietary Supplement For Stomach Discomfort Mastic gum, a natural resin from the Pistacia lentiscus tree of Greece, has been used traditionally by Mediterranean cultures to support gastrointestinal health. Source Naturals Mastic Gum Extract supports a healthy stomach lining and may help relieve digestive discomfort. Информация о добавках Serving Size: 2 Capsules Servings Per Container: 30 Amount Per Serving %DV Calcium 38 mg 3% Mastic Gum Ext. (Pistacia lentiscus) 1 g † †Daily Value not established.