Digestive Support Chios Gum Mastic (also known as Mastiha) is the resinous material obtained from the Pistacia lentiscus tree, grown on the island of Chios in Greece, where it has traditionally been used as a healthy food for the gastrointestinal tract. Ingredients: Serving Size: 2 capsules Servings Per Container: 60 or 120 Amount per serving Pistacia lentiscus var. Chia (Resin): 1 g Other Ingredients: