Mastic (Pistacia lentiscus) is an evergreen shrub found throughout the Mediterranean. The sap (resin) from its trunk is used to make medicine.

Mastic might help reduce stomach acid and protect the lining of the stomach and intestine. It might also have antibacterial effects and reduce swelling.

People use mastic for stomach ulcers, indigestion, Crohn disease, wound healing, and many other conditions, but there is no good scientific evidence to support most of these uses.

Don't confuse mastic with gum arabic. These are not the same.

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