Introduction. Antioxidant therapy is the optimal type of treatment for idiopathic male infertility due to the good ratio of efficacy and safety. Considering that oxidative stress is one of the pathogenetic links in sperm DNA damage, antioxidant drugs can also reduce the DNA fragmentation index. Men who are overweight or severely obese have a high risk of sexual dysfunction and reproductive disorders. Antioxidant therapy plays a leading role in infertility associated with metabolic syndrome. The main active ingredients in «BESTFertil-DHA» are L-carnitine, eicosapentaenoic and docosahexaenoic acids, the action of which is complemented by other components, which makes the use of the complex attractive in combination with male infertility and metabolic syndrome. However, it is unknown how well they work with a combination of these pathological conditions. Aim. Is to evaluate the effectiveness of administration of Russian complex «BESTFertil-DHA» on spermogram parameters and the index of sperm DNA fragmentation in men from infertile couples with metabolic syndrome. Materials and methods. The study included 60 patients divided into cohort A- 26 patients with metabolic syndrome, cohort B- 34 patients without metabolic syndrome. All patients received «BESTFertil-DHA». All patients underwent a spermogram, an analysis for the fermentation of sperm DNA, blood for sex hormones, markers of metabolic syndrome on the first visit, and on the 2nd visit after therapy. Results. In cohort A, significant results were observed in terms of weight, BMI, C-reactive protein level, and HOMA-IR index. There is a significant improvement in the parameters of the spermogram, a decrease in the index of fragmentation of sperm DNA, a decrease in estradiol, normalization of the T/E2 index. In cohort B, changes in weight, BMI and a number of spermological parameters were observed, there were no changes in metabolic and endocrine parameters. Conclusion. Combined antioxidant therapy in the form of a complex of nutrients «BESTFertil-DHA» effectively reduces the index of fragmentation of sperm DNA and leads to normalization of spermogram parameters, both in the general cohort of patients and among men with metabolic syndrome. Moreover, in the latter, the «BESTFertilDHA» complex in combination with measures to reduce body weight gives additional therapeutic effects, affecting carbohydrate metabolism, aromatization of testosterone and the severity of systemic inflammation
