Effect of L-fucose and fucose-ric…n vivo and in vitro.

L-fucose and fucose-rich polysaccharides increased elastic fiber density by about 40% in hairless rats after 4 weeks of topical application. In lab-grown human skin cells, these ingredients boosted tropoelastin (a building block of elastin) production by roughly 40%. The effect was specific to elastin—L-fucose actually decreased collagen production.