Quercus Infectoria gall extract is a tannin-rich plant derivative valued for its astringent, antimicrobial, and antioxidant properties, used in topical formulations for skin tightening and protection. Its high gallotannin and gallic acid content underlies most of its biological activity.
| Reported effect | How often | Notes |
|---|---|---|
| Contact irritation | Uncommon | High tannin content can cause mild stinging or dryness, particularly on sensitive or compromised skin. |
| Allergic contact dermatitis | Rare | Sensitization to plant tannins or phenolics has been occasionally reported. |
| Skin tightness or excessive dryness | Uncommon | Astringent action may overly dry skin with frequent or high-concentration use. |
| Temporary skin staining | Rare | Tannins can produce mild transient discoloration on skin or fabrics. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.