Abstract: An object of the invention is to offer an optical additive capable of adequately activating the effects of incorporated optically active substances, providing the base with such optical effects, having a suitable sensation and level of safety, and having exceptional cosmetic properties. A cosmetic composition comprising in a physiologically acceptable medium (a) silicium based porous particles having an aspect ratio of at least 2 and (b) an optically active substance incorporated into said porous particles is offered. The incorporated optically active substances are selected from among UV screening substances, fluorescent substances and photochromic substances.

Abstract: A gel composition and cosmetic composition and the like that can excel in pigment and/or filler uniformity and stability and can have a good outer appearance even when further comprising a relatively large amount of pigments. A gel composition is formed by combining at least one ingredient chosen from pigments and fillers, wherein the at least one ingredient has been surface-treated by at least one water-repellent oil-repellent agent, and at least one gelling agent comprising at least one polyacrylamide-based polymer.