Abstract: A pulverulent composition includes less than 96% in weight, preferably from 10 to 80%, and more preferably from 20% to 70%, of at least a vitamin having a solubility lower than 20 g/L and preferably 1 g/L and more preferably lower than 500 mg/L in aqueous media, the pulverulent composition being stable on storage and having instantaneous dispersion and solubility properties in aqueous solutions.

Abstract: The invention relates to the use of at least one viscous compound, the viscosity of which is greater than 5 Pa·s?1, to substantially prevent the degradation of a substance sensitive to temperatures of 20° C. to 100° C. and/or pressures of 106 to 107 Pa and/or a relative humidity of 60% to 100%, contained in a powder composition, the powder composition containing particles including: a core containing the sensitive substance and at least one viscous compound as impregnating agent for the sensitive substance and a coating for the core, which contains at least one viscous compound as sticking agent.

Abstract: Method of preparing a non-hygroscopic pulverulent composition, includes a step for the spray drying, without an atomization support, of an aqueous solution containing at least one initially hygroscopic product, having a glass transition temperature ranging from 10° C. to 110° C., and a cryogenic fluid, especially a food-grade cryogenic fluid, or a mixture of cryogenic fluids, particularly chosen from liquid air, nitrogen and carbon dioxide, the aqueous solution being obtained by dissolving the cryogenic fluid in an initial aqueous solution containing the initially hygroscopic product.