A method of treating skin is disclosed. The method can include topically applying to a person's skin a composition comprising 0.0001% to 5% w/w of a hydrolyzed algae extract comprising exopolysaccharides from Halymenia durvillei, and 0.0001% to 5% w/w of a saccharide isomerate comprising an exopolysaccharide synthesized by Vibrio alginolyticus, wherein at least one of skin permeability is decreased, filaggrin production is increased, skin moisture is increased, occludin production is increased, or TNFα production is inhibited in the skin.