Abstract: Process with the aim of preventing or slowing the appearance of unattractive signs, generated by the pollutants present in the atmosphere, on the skin, the scalp, the hair or the mucous membranes, or indeed of eliminating them, including a step of application of a cosmetic formulation for topical use, including at least one cosmetically acceptable excipient and an effective amount of at least one glycolic extract (GE) of a unialgal biomass of small multicellular macroalgae originating from the Florideophyceae class. The extract, for the use thereof in a therapeutic method for treating signs of irritation of the skin, the scalp or the mucous membranes, manifesting as redness, sensations of stinging and/or itching, signs of deterioration of the hair, manifesting as an increase in the porosity thereof, the dulling thereof, and/or the weakening thereof with regard to mechanical stresses.

Abstract: A process for improvement of the moisturization state of thestratum corneum of human skin epidermis includes at least one step a) of applying, to the surface of the skin to be treated, an effective amount of a composition for topical use including at least one cosmetically acceptable excipient and a composition C1 including 20-50% by weight of composition C2, which in turn includes from 3-25% by weight of a polyol of formula (I): HO—CH2-(CHOH)m-CH2-OH (I); (2)—from 25-45% by weight anhydrides of the polyol of formula (I); (3)—from 30-72% by weight of a composition CA represented by formula (II): HO—CH2-(CHOH)m-CH2-0-(G)x-H (II), (4) the remainder to 100% by weight being made up of water; and—(b)—from 50-80% by weight of at least one compound of formula (III): HO—[CH2-CH(OH)—CH2-O]p-H (III).