MasticaAllergy Research Mastica has traditionally been used as a healthy food for the gastrointestinal tract. Chios Gum Mastic is the resinous material obtained from the Pistacia lentiscus tree, grown on the island of Chios in Greece. *Supports a healthy microbial balance in the gastrointestinal tract, including the oral cavity and stomach *Helps reduce digestive discomfort *Promotes health of gastrointestinal mucosa in upper and lower digestive tract