Currently, one of the global problems of world health is the widespread occurrence of chronic non-communicable diseases caused by individual psychological and social correlates of nutrition, as well as insufficient physical activity. One of the ways to solve this problem is to conduct an effective policy of rationalizing the population's nutrition by introducing new specialized food products for dietary and preventive nutrition into the diet. In this regard, it is relevant to develop new healthy food products from the range of confectionery products enriched with various natural biologically active compounds that have pronounced restorative and immunomodulatory properties, using modern biotechnological approaches. The purpose of this research was to study the technological features of the enrichment of chocolate products with sulfated polysaccharide – fucoidan, isolated from brown algae. The article presents data on the use of mare's milk powder and fucoidan in the design of chocolate products with desired properties. In the course of the study, the optimal doses of adding fucoidan powder to the composition of chocolate were studied, and the organoleptic and physicochemical properties of the developed products were evaluated. The applied doses of fucoidan powder were studied at concentrations of 0.001%, 0.005%, 0.01% and 0.05%. The results of the assessment of organoleptic and physico-chemical parameters of laboratory batches of chocolate products showed that the optimal dose of fucoidan powder, as a functional component, is a concentration of 0.01 g per 100 g of the product. Based on the results of the study, the composition and technology for the production of specialized chocolate products was developed.