Abstract: A composition comprising an aqueous dispersion of lipid vesicles encapsulating at least one compound which screens out UV radiation and contains at least one free or at least partially neutralized acidic function, wherein the lipid vesicles have a lipid membrane formed from at least one nonionic amphiphilic lipid (A) or from at least one saturated hydrocarbon ionic amphiphilic lipid (B) having an iodine number of less than 10, and from at least one totally neutralized ionic amphiphilic lipid (C) is disclosed. The use of this composition as a base for products to care for the skin, the scalp, the hair, the eyelashes or the eyebrows, as a base for make-up products, and more particularly as bases for compositions to protect the human epidermis, the hair, the eyelashes or the eyebrows against ultraviolet rays are also disclosed.

Abstract: An oil-in-water nanoemulsion in which the oil globules have a mean size of less than 100 nm and which contains an amphiphilic lipid component containing at least one non-ionic amphiphilic lipid which is liquid at an ambient temperature of less than 45.degree. C. The nanoemulsion can be used in the fields of cosmetics and dermopharmaceuticals. The nanoemulsion is stable on storage, can contain significant amounts of oil while retaining good transparency, and can contain heat-sensitive active agents.

Abstract: The use of natural or synthetic ceramides as agents for thickening a medium, particularly a non-aqueous medium, and a thickened medium containing such a thickening agent The medium thus thickened may be used in the cosmetic, pharmaceutical, paint, varnish, lubricant, combustible, and food industries.