FIELD : medicine; food industry. SUBSTANCE : invention relates to nanotechnology, medicine, and food industry. Distinctive feature of the proposed method is using as a nucleus of a dry extract of a sweet vetch and a shell of nano capsules of kappa-carrageenan, as well as use of precipitant - 1, 2-dichloroethane when producing nanocapsules by physical-chemical non-solvent deposition method. EFFECT : technical task of invention is to simplify and accelerate process of production of nanocapsules and increase mass output. 1 cl, 3 ex