Limonene is common in citrus fruits and thus gives off a citrus scent. It can also be found in peppermint and rosemary, as well as cannabis. Limonene has a variety of effects on the body, including fighting cancer, acting as an antidepressant or antianxiety agent, has antibacterial properties, and may help with heartburn (gastroesophageal reflux).

Author Matthew Mintz, MD