Allium Cepa (Onion) Extract is derived from onion bulbs and contains flavonoids such as quercetin, along with sulfur compounds, that provide antioxidant and anti-inflammatory activity. It is most commonly used in topical scar-management products, where it is thought to help modulate collagen and improve the appearance of scars.
| Reported effect | How often | Notes |
|---|---|---|
| Mild skin irritation or stinging | Uncommon | Transient redness or burning at the application site, usually mild and self-limiting. |
| Allergic contact dermatitis | Rare | Sensitization to onion or related Allium compounds can produce localized eczematous reactions. |
| Contact urticaria | Very rare | Immediate hives reported mainly in individuals with onion/Allium allergy. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.