Abstract: This invention is directed to a skin care composition comprising a laminriacea (brown seaweed) extract and the use of said composition in the treatment of skin aging signs Specifically, it was discovered that a crude extract of the laminariacea Saccharina Longicruris has a strong potential for anti-senescence and anti-cellular aging effect and is efficient to restore the contraction of the collagen network of aged cell lattices to the level of contraction of young cells.

Abstract: The present invention concerns the gelation of an undenatured protein and a polysaccharide dispersions by a gradual pH adjustment of their mixture The final pH of the mixture is close to or lower than the isoelectric point of the protein when anionic polysaccharides are used. In the present invention, the undenatured protein and the polysaccharide in the gel state have net opposite electric charges. The concentration of protein and polysaccharide preferably ranges from 0.02 to 10 wt %. The present invention also concerns a gel obtained by this method.