Bupleurum Falcatum Root Extract

Bupleurum falcatum root extract is a botanical anti-inflammatory/soothing extract used at low levels (typically <1–2%) in cosmetics, but like many plant extracts it contains multiple bioactive constituents (e.g., saponins/flavonoids) that can provoke stinging or contact dermatitis in a reactive subset. Human patch-test and clinical irritation data are limited and not robust enough to classify it as reliably “very gentle” for compromised skin. Given the uncertainty and the known higher sensitization risk category of botanicals, a mild irritation score is the safest clinically aligned choice. Safety Notes: In commercial skincare, Bupleurum falcatum root extract is most often used as a soothing/anti-redness botanical in leave-on toners/serums/creams at very low levels (often ~0.001–0.1%) because it is typically supplied as a dilute glycerin/butanediol/water extract and is used as part of a multi-extract blend. Higher-strength consumer products (mostly K-beauty/J-beauty “herbal” ampoules/essences or minimalist botanical-focused serums) can reach ~1–5% when the extract is a standardized, low-odor liquid or powder reconstituted into the formula; above this becomes uncommon due to color/odor, potential tackiness, and stability/compatibility constraints rather than regulatory limits. Rinse-off products generally sit at the lower end (≈0.001–0.5%) since contact time is short and botanical loads are often minimized for cost and sensory reasons.