Abstract: An aqueous composition for the stimulation of the immune system for the purpose of preventing at least one of the diseases provoked by the invasion of one or several pathogenic agents through the skin, the eye or a mucous membrane. The aqueous composition is obtained from seawater and includes a sulphated polysaccharide contained in a seaweed.

Abstract: An algal extract-based composition for oro-dental use is provided. This composition comprising a mixture of algae with at least Ascophyllum nodosum and Fucus spp. is characterized in that said mixture of algae has a proportion of Ascophyllum nodosum of at least 90% of the weight of the mixture and that the proportion of Fucus spp. is at most 10% of the weight of the mixture, and in that said extract is combined with a natural surfactant and/or with a zeolite or a mixture of zeolites. Uses of said composition, in particular for dental prevention and/or care, are also provided. Applications in the oro-dental field, both preventively and curatively.

Abstract: An algal extract-based composition for oro-dental use is provided. This composition comprising a mixture of algae with at least Ascophyllum nodusum and Fucus spp, is characterized in that said mixture of algae has a proportion of Ascophyllum nodusum of at least 90% of the weight of the mixture and that the proportion of Fucus spp. is at most 10% of the weight of the mixture, and in that said extract is combined with a natural surfactant and/or with a zeolite or a mixture of zeolites. Uses of said composition, in particular tot dental prevention and or care are also provided. Applications in the oro-dental field, both preventively and curatively.