Cinnamomum Cassia Bark Extract is derived from the bark of the cassia (Chinese cinnamon) tree and is used in skincare for its antioxidant, antimicrobial, and mild anti-inflammatory properties, often as a fragrant or conditioning additive. It contains cinnamaldehyde and related compounds that contribute to its activity but also to its irritant potential.
| Reported effect | How often | Notes |
|---|---|---|
| Contact irritation (redness, stinging, burning) | Common | Cinnamaldehyde content makes it a frequent skin irritant, especially at higher concentrations. |
| Allergic contact dermatitis | Uncommon | Cinnamic compounds are recognized contact allergens and can sensitize susceptible individuals. |
| Photosensitivity / increased sun sensitivity | Rare | Occasional reports of heightened reactivity to sunlight after topical use. |
| Contact urticaria (hives) | Rare | Immediate-type reaction reported with cinnamon-derived ingredients. |
| Perioral or mucosal irritation | Very rare | Mainly noted with lip or oral-area products containing cinnamon extracts. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.