Perilla alcohol is a naturally occurring monoterpene related to limonene. It is isolated from the essential oils of lavender, peppermint, spearmint, cherries, celery seeds, and several other plants. It has been used topically as a mosquito repellant and in toiletries and may be touted as a constituent of natural products such as tart cherry juice. Perillyl alcohol has demonstrated antiangiogenesis and anticancer effects in vitro. Purported mechanism of action is suppression of the synthesis of small G proteins, including RAS, thereby arresting tumor cells in the G1 phase of the cell cycle. Early clinical studies did not efficacy in prostate, ovarian or breast cancer, probably due to bad pharmacokinetic properties and toxicity after oral administration. More recent preliminary studies found intranasal delivery in patients with malignant gliomas to be well-tolerated and effective, with one study reporting tumor size regression, and another reporting increased overall survival and no side effects after long-term use.

Thymol, a monoterpene, obtained from thyme oil or other volatile oils, is used as a stabilizer in pharmaceutic preparations. It has been used for its antiseptic, antibacterial, and antifungal actions to help reduce and prevent plaque and gingivitis. Recently was shown, that this substance was able to significantly reduce the oxidative stress associated with cataract. The results suggested that thymol might be a potential therapeutic approach in the prevention of diabetic complications through its aldose reductase enzyme inhibitory and antioxidant activities.

Linalool (3,7-dimethyl-1,6-octadien-3-ol) is a very fragrant component of various herbs such as lavender, mint, and coriander that can be a potent skin irritant, causing contact dermatitis in some sensitive individuals. Linalool is used as a scent in perfumed hygiene products and cleaning agents including soaps, detergents, shampoos, and lotions. Linalool is used by pest professionals as a flea, fruit fly, and cockroach insecticide. It can also be used a method of pest control for codling moths. Linalool creates a synergistic effect with the codling moth's pheromone called codlemone, which increases the attraction of males. Linalool can be absorbed by inhalation of its aerosol and by oral intake or skin absorption, potentially causing irritation, pain and allergic reactions.