active agent comprising a synergistic mixture of soluble collagen extracted from cnidarians, and zooplankton, and cosmetic composition containing the cosmetic care process comprising the topical application of the composition.Agent actif comprenant un mélange synergique de collagène soluble issu de cnidaires et dextrait de zooplancton, composition cosmétique les contenant et procédé de soin cosmétique comprenant lapplication topique de ladite composition.