Scientific review covers current data regarding the role of quercetin in the therapeutic corrections of various liver diseases, in particular non-alcoholic fatty liver disease, chronic hepatitis, drug-induced liver disease. The aim of the review was to sum up current scientific data regarding quercetin properties, its mechanism of action and possibilities of this flavonoid in the treatment of various liver diseases.Conclusions. Quercetin is found to possess antioxidant, anti-inflammatory, hypolipidemic, antisteatotic and antifibrotic properties. The abovementioned makes this flavonoid potentially useful in the treatment of various liver disease, in particular non-alcoholic fatty liver disease, chronic hepatitis of different etiologies, and drug induced liver disease.

The aim: To substantiate the need of wider use of species in dietician rehabilitation of patients with poly- and comorbidity, postcovid syndrome based on the analysis of the latest scientific achievements with the study of their pharmacological properties. Materials and methods: The information search in printed and electronic editions, search scientific bases with application of methods of the analysis, comparison and generalization of information data is carried out. Conclusions: New scientific data on the pharmacological properties of spices give grounds to use them more widely in the rehabilitation of patients with poly- and comorbidities and infectious processes.