The object of the invention is to provide a method for the non-carrier loading of naturally crystalline substance solubilized by a solvent mixture in a lipophilic medium in a mixture of granulated polymers intended to form, without plasticizer, a polymeric carrier of controlled long-term distribution. said naturally crystalline substance in the stable solubilized state, without crystallization at the surface of said support permanently. Said substance according to the invention may be pyrethroid insecticides and pesticides (eg Deltamethrin), formamidines (eg Amitraz) and carbamates (eg Propoxur), or mixtures thereof, or cosmetics of the alkaloids group ( Ex. Caffeine), or drugs (eg Ibuprofen). The state of permanent non-crystallization on the surface of the polymeric support is ensured only when said substance is solubilized in the solvent mixture composed of an oxygenated solvent of dibasic esters of methylenic fatty acids and of an oxygenated methylenic cosolvent in lipophilic solution. active ingredient incorporated in a polymer blend composed of a polyether block amide (PEBA) and a thermoplastic polyurethane elastomer (TPU). Said support can be shaped as a collar, a pet earplate, a bracelet, a patch, a wafer, a polymer block or any other device for distributing active ingredients. It is shaped by any of the techniques of plastics known to those skilled in the art. It has the advantage of being loaded with 30% to 50% less than previous asset size devices for at least the same active efficiency.L'invention a pour objet la réalisation d'un procédé de chargement sans véhicule de substance naturellement cristalline solubilisée par un mélange solvant en milieu lipophile dans un mélange de polymères en granulés destiné à former sans plastifiant un support polymère de distribution contrôlée de longue durée de ladite substance naturellement cristalline à l'état solubilisé stable, sans cristallisation à la surface dudit support de façon permanente. Ladite substance selon
