An extract of the seeds of the Kniphofia uvaria plant is obtained by bringing into contact with at least one cosmetically acceptable nonpolar solvent, for example, CO2, under supercritical conditions, or by mechanical pressing. This disclosure also relates to a cosmetic or dermatological composition comprising said extract. This disclosure also relates to a cosmetic or dermatological care method comprising the application of said composition for preventing or delaying the appearance of the signs of skin aging, modulating the reactivity of sensitive skin, or maintaining the barrier function of the skin.