Cinnamon bark extract (from Cinnamomum species) is a plant-derived ingredient used in skincare for its antioxidant, antimicrobial, and mild circulation-stimulating properties, often included in anti-aging or blemish-targeted formulations. Its active constituents include cinnamaldehyde and various polyphenols.
| Reported effect | How often | Notes |
|---|---|---|
| Contact irritation (redness, stinging, burning) | Common | Cinnamaldehyde is a known irritant, especially at higher concentrations or on sensitive skin. |
| Allergic contact dermatitis | Uncommon | Cinnamaldehyde and cinnamyl alcohol are recognized fragrance allergens and frequent positive reactors on patch testing. |
| Perioral or mucosal irritation | Uncommon | Reported with leave-on lip or facial products containing cinnamon derivatives. |
| Photosensitivity or pigmentation changes | Rare | Occasional reports; data limited and less established than for other botanicals. |
| Severe systemic or anaphylactic reaction | Very rare | Isolated case reports, primarily linked to ingestion rather than topical use. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.