Hydrolyzed Eruca Sativa Leaf

Hydrolyzed Eruca sativa (arugula) leaf is a plant-derived protein/peptide extract used mainly as a conditioning/“hair-skin strengthening” agent, typically at low percentages, but hydrolysates and botanical extracts are not inert and can provoke stinging or dermatitis in reactive or eczematous skin. Clinical patch-test data for this specific hydrolysate is limited, so patient-safety weighting relies on class risk: botanical-derived proteins/extracts have a meaningful (though not high) potential for irritant reactions and occasional sensitization, especially on compromised barriers. Given uncertainty and the need to avoid underestimating risk in severe sensitivities, a mild irritancy score is appropriate. Safety Notes: Hydrolyzed Eruca sativa (arugula) leaf is typically supplied as a dilute active (often in water/glycerin or butylene glycol) used primarily in hair/scalp and lash/brow-style leave-on serums as a conditioning/fortifying botanical, with many mass-market formulas using it at ~0.01–0.3% as a label-claim minor active. High-strength consumer “booster”/serum products and some natural hair masks can push the supplier-recommended use levels to ~1–5% for the commercial ingredient blend, while higher levels are uncommon due to cost, sensory/stability constraints, and diminishing formulation benefit; no specific EU/FDA cosmetic maximum applies beyond general safety substantiation.