Inula Helenium Extract

Inula helenium (elecampane) extract is a botanical anti-inflammatory/soothing agent typically used at low concentrations, but it contains sesquiterpene lactones (e.g., alantolactone/isoalantolactone) that are well-documented contact allergens in patch testing and can trigger dermatitis in sensitized or eczematous patients. Because allergy-driven irritation can be delayed and clinically significant even at small doses—especially with cumulative leave-on use—I rate it as a moderate irritancy risk requiring patch testing in sensitive skin. Safety Notes: Inula helenium extract is typically used as a supporting botanical/soothing antioxidant at very low levels in mainstream leave-on products (often as part of a multi-extract blend), with commercially observed use starting around ~0.0005% when present mainly for label/marketing or trace-level contribution. Dedicated botanical serums, creams, and scalp treatments marketed as high-strength “plant extract” formulas can reach ~1–2% for the standalone extract in OTC leave-on products, with higher levels being uncommon due to odor/color impact and potential sensitization constraints; rinse-off products generally sit toward the lower end because of short contact time.