Terpineol is any of four isomeric monoterpenoids, i.e., α-, β-, γ-terpineol, and terpinen-4-ol. In most of case, Terpineol is usually a mixture of β-, γ-terpineol, and terpinen-4-ol isomers with α-terpineol as the major constituent.

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• α-Terpineol: Alpha Terpineol, other than pine and petitgrain, is the most common terpineol isomer found in cannabis, having a wide range of biological applications such as anticancer, antioxidant, anticonvulsant, antihypertensive, antiulcer, and anti-nociceptive compound. That’s why it is broadly used in several therapeutic applications. 

• β-Terpineol: Beta Terpineol is cyclohexanol having additional methyl and propenyl substituents. It has a strong, woody–earthy odor and plays a role as a plant metabolite. β-Terpineol is usually found in cannabis products, but it’s far less common than alpha isomer.

• Γ-Terpineol: Γ-Terpineol, also termed as Gamma-terpineol, is a p-menthane monoterpenoid. The only thing that differentiates Γ-Terpineol from beta terpineol is the location of a double-bond.

• Terpinen-4-ol: Terpinen-4-ol is extracted from leaves and shrubs of Melaleuca alternifolia tree, which contains 4% of cineole and 11 X terpinen-4-ol. The extracted oil has shown antimicrobial activity.