Dunaliella Salina Extract

Dunaliella Salina Extract is a microalgae extract primarily used as an antioxidant/skin-conditioning agent, typically included at low percentages, and it is generally well tolerated in cosmetic use. However, as a biologically derived extract containing mixed proteins/pigments (e.g., carotenoids), it carries a small but real risk of irritation or sensitization in highly reactive or eczematous skin, especially in leave-on products. Given patient-safety considerations and the variability of extract composition, I rate it as gentle but not inert. Safety Notes: In commercial skincare, Dunaliella salina extract (often used as an antioxidant/carotenoid-rich microalgae extract) is frequently dosed at very low levels when supplied as a standardized glycerin/water carrier or as part of a multi-extract complex, with finished-product use levels observed down to ~0.0005%. Typical leave-on serums/creams more commonly sit around ~0.01–0.5%, while the highest consumer-available “booster”/ampoule-style products and algae-focused formulations can reach ~1–5% depending on supplier form (true extract vs dilute solution) and color/odor constraints. Rinse-off products generally stay toward the low end because of cost and limited contact time, while leave-on products account for most of the upper-range usage.