Side Effects of Mastic gum / Mastiha of Chios

Mastic is possibly safe for most people when taken appropriately by mouth.

Special Precautions & Warnings:

Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking mastic if you are pregnant or breast-feeding. Stay on the safe side and avoid use.

Allergy to Schinus Terebinth Folious and other Pistacia species: People who are allergic to these plants might also be allergic to mastic tree.

(Source: www.webmd.com)