The object of the invention is a process for obtaining an active ingredient for increasing the mechanical strength of the skin, wherein the process utilizes the following steps: Solubilization of rye fibers and/or seeds and/or bran in water, Simultaneous or successive enzymatic hydrolysis or hydrolyses, Separation of soluble and insoluble phases by filtration, centrifuging, decanting, Treatment of the active fraction, and Sterilizing filtration.The product obtained by the process, cosmetic compositions containing the product, and method of using the product are also disclosed.