Argatensyl™ is a fraction rich in high molecular weight proteins (> 200 000 daltons) has been identified and isolated from the oilcake of the Argania spinosa tree. Made soluble in water, for an easy incorporation into the cosmetic product. It provides very interesting surface properties. When applied on skin, these molecules form a network having a high affinity to the skin’s surface. It develops a perceivable effect. Its immediate tightening effect as well as its wrinkle reducing effect have been demonstrated in clinical study: effect on neck wrinkles.