Pinene is a monoterpene found in balsam fir, cajuput, cumin, cypress, frankincense, juniper, angelica, nutmeg, pine, rosemary, and coriander. If oxidation occurs, pinenes can cause skin irritation. Oxidation occurs when essential oils are exposed to oxygen due to poor storage and old age. Monoterpenes are odorless, highly volatile, prone to oxidation, […]