Tannic acid is a plant-derived polyphenolic compound used in skincare for its astringent, antioxidant, and mild antimicrobial properties. It can help tighten skin, reduce oiliness, and provide protection against oxidative stress.
| Reported effect | How often | Notes |
|---|---|---|
Skin irritation or dryness | Common | Astringent action can cause tightness, flaking, or irritation, especially on sensitive skin or at higher concentrations. |
Allergic contact dermatitis | Uncommon | Sensitization may occur, presenting as redness, itching, or rash in predisposed individuals. |
Skin staining or discoloration | Rare | Prolonged or high-concentration use may cause temporary brownish staining of the skin. |
Systemic toxicity from large-area absorption | Very rare | Historically reported with extensive application to broken or burned skin; not a concern with normal cosmetic use. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.