Abstract The article presents the results of a study of the chemical composition, as well as the content of phenolic compounds and anthocyanins in dark grape varieties. These results confirm the feasibility of using this raw material as a source of antioxidants. The results of the study of the amino acid and fractional composition of pectin substances in the sea grass of the family Zostera marina L. are also presented. Its high biological value is noted. The obtained data on the physical and chemical composition of the new pectin-containing drink based on grape juice allow us to speak about the presence of functional properties.