Colloidal gold consists of suspended gold nanoparticles used in skincare for purported antioxidant, anti-inflammatory, and soothing effects. Evidence for cosmetic benefit is limited, and it is often included as a marketing-driven luxury ingredient.
| Reported effect | How often | Notes |
|---|---|---|
| Allergic contact dermatitis | Uncommon | Gold is a recognized contact allergen; sensitized individuals may develop redness, itching, or eczema. |
| Localized skin irritation | Rare | Mild redness or stinging may occur, more often in sensitive skin. |
| Chrysiasis (skin discoloration) | Very rare | Bluish-gray pigmentation reported mainly with systemic/injected gold, not typical topical cosmetic use. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.