Urtica Dioica Extract

Urtica dioica (stinging nettle) extract is used in low concentrations as a botanical soothing/anti-inflammatory or sebum-balancing agent, but plant extracts carry variable composition and can trigger irritant reactions or allergic contact dermatitis in reactive and eczema-prone patients. While generally tolerated by many users, clinical patch testing and case reports across botanicals support a non-trivial risk of sensitivity, especially in compromised skin barriers and in multi-ingredient routines. Given this variability and patient-safety prioritization, I score it as mild with occasional sensitivity possible. Safety Notes: In commercial skincare and scalp-care products, Urtica dioica (nettle) extract is commonly used at very low levels (~0.01–0.2%) as part of botanical blends where it primarily supports marketing/soothing or oil-control claims. Mid-range use (0.5–3%) is seen in toners, gels, and creams where the extract is a more meaningful active-support component. High-strength consumer-available formulas (typically water/glycerin extracts or concentrated botanical complexes) can reach ~5–10% in leave-on serums/ampoules and some rinse-off masks/shampoos, with the practical ceiling driven by odor/color, stability, and irritation potential rather than specific regulatory limits.