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Cassia essential oil (Cinnamomum cassia) is strong and can easily irritate skin. Some sources recommend not using the oil in home aromatherapy.
Cassia bark oil is almost identical to and has most of the same uses as cinnamon bark oil. Unfortunately, commercial cassia bark is commonly adulterated, according to Aromatica: A Clinical Guide to Essential Oil Therapeutics, Volume 2. Several sources suggest cinnamon bark is a better choice than cassia.
However, if you are interested in exploring cassia, here's some basic information.
Plant family: Lauraceae
Production: Cassia bark is steam distilled from the bark of the tree and cassia leaf is steam distilled from the leaves. The two may be mixed into one oil — buy from a trusted source and know what you're buying.
Aroma: The leaf oil is spicy, sweet, woodsy. The bark oil is strong, spicy, warm, resinous.
Perfume/Aromatic note: Middle.
Is cassia essential oil safe to use during pregnancy? No, and do not use while breastfeeding.
Is cassia safe for children? Do not use with young children.
Cautions: Do not use on hypersensitive, damaged, or diseased skin. Using on skin may lead to adverse reactions.
Source: Essential Oil Safety, 2nd Edition
Uses of cassia essential oil include adding it to diffuser blends for a spicy note.
Meditation Diffuser Blend
Air Refreshing Diffuser Blend
Source: Young Living
Fall Spice Diffuser Blend
Use according to manufacturer's instructions for your aromatherapy diffuser.
Warming massage blend: Dilute one drop cassia in 1/4 cup carrier oil. Spot test before using on large areas. Do not use on diseased or damaged skin.
To help reduce muscle and joint pain and inflammation:
Blend the ingredients in a small glass container that has a tight-fitting lid for storage. Store the blend in a dark, cool space for up to six months.
Spot test before using on large areas or skin.
Apply a small amount once or twice a day to affected areas.
Source: Llewellyn's Book of Natural Remedies
Potpourri: Scent pine cones with cassia, clove bud, and sweet orange essential oils. Source: Plant Therapy
Toilet Refresh Spray
Use this spray to get of rid unpleasant odors and germs.
Add ingredients to the bottle. Shake well. Spray into the toilet bowl and on other toilet surfaces. Avoid skin contact. Source: Loving Essentials
Photo Credit: Honmingjun, CC BY-SA 3.0, via Wikimedia Commons