FIELD : nanotechnologies; medicine; food industry.SUBSTANCE : invention relates to nanotechnology, medicine, and food industry. Distinctive feature of the proposed method is the use of a dandelion extract and a shell of sodium alginate nanocapsules as the core of a dry extract, as well as the use of a precipitant – butyl chloride in the preparation of nanocapsules by a physicochemical deposition method with a non-solvent.EFFECT : technical task of invention is to simplify and accelerate process of production of nanocapsules and increase mass output.1 cl, 3 ex