Cassia essential oil is steam-distilled from the bark of the Cinnamomum cassia tree in the Lauraceae family. It has a spicy, warm, sweet aroma.
Historically, cassia has been widely used as a domestic spice. It has also been used medicinally to treat colds, colic, diarrhea, nausea, rheumatism, and digestive complaints.
Cassia oil is best used in small amounts blended with other oils, as it can be very sensitizing to the dermal tissues. Cassia is generally regarded as safe (GRAS) for human consumption but should be well diluted when taken orally.
Cassia oil is considered to have antibacterial, antifungal, and antiviral properties.
See the Reference Guide for Essential Oils to learn more about cassia essential oil and many other pure essential oils.
Source: Reference Guide for Essential Oils, 2016 Edition, pp. 53–54.