Juglans Regia (walnut) refers to extracts or, more commonly, ground walnut shell powder derived from the English walnut plant. In skincare it is used chiefly as a physical exfoliant in scrubs, though seed and leaf extracts may also provide antioxidant and astringent properties.
| Reported effect | How often | Notes |
|---|---|---|
| Mechanical skin irritation or microtears | Common | Ground walnut shell has irregular, sharp edges that can abrade the skin barrier, especially with vigorous scrubbing. |
| Redness and transient stinging | Uncommon | More likely on sensitive, thin, or compromised skin. |
| Allergic contact dermatitis | Rare | Tree nut–derived material may trigger sensitization in predisposed individuals. |
| Acne aggravation from over-exfoliation | Rare | Excessive use may worsen inflammatory acne by disrupting the barrier. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.