Brassica Oleracea Acephala Leaf Extract

Brassica Oleracea Acephala (kale) leaf extract is primarily an antioxidant/soothing botanical used at low percentages, and it is generally well-tolerated in routine patch-test experience when properly purified. However, as a plant extract it contains multiple bioactive compounds that can trigger irritant or allergic contact dermatitis in a small but real subset of highly reactive or eczematous patients, especially when combined with other actives in a full routine. Given this non-zero sensitization potential typical of botanicals, it fits a 'gentle' but not 'very gentle/inert' profile. Safety Notes: In commercial skincare, kale (Brassica Oleracea Acephala) leaf extract is frequently used as a minor antioxidant/soothing botanical, often appearing in multi-extract blends at trace-to-low levels around 0.001–0.1% (especially in rinse-off cleansers and broadly positioned “greens” formulas). Leave-on serums/creams and “superfood/antioxidant” products commonly use it at ~0.1–2%, while a smaller set of consumer-available high-botanical or single-hero extract products reach ~3–5% depending on supplier strength (e.g., glycerin/butanediol extracts) and sensorial/stability constraints. No specific FDA/EU maximum applies to this botanical extract, so practical market limits are driven by odor/color, stability, and irritation potential rather than regulation.