The purpose of the study was to assess the effect of 35-day Cytoflavin consumption on hormonal status, blood lactate level and functional parameters in elite ice hockey players. Material and methods: the study included 60 male professional hockey players (aged 19 to 36 years) divided into two groups of 30 subjects. Group I underwent a course of metabolic therapy with the use of succinic acid (Cytoflavin) for 35 days. Group II whose pharmacological support included only "basic" sports nutrition did not include succinic acid preparations or other metabolic agents. All patients underwent blood pressure and heart rate measurements, laboratory tests, pulse oximetry, ergospirometry. Trends in lactate levels in the blood and hormonal status in athletes were assessed. Moreover, such parameters as testing time, maximum heart rate, maximum oxygen consumption (VO2max), aerobic and anaerobic threshold pulse, time to reach the aerobic and anaerobic threshold were analyzed. Results: athletes who received a course of metabolic therapy on the 35th day of the preparatory period showed a significant increase in the indicators of maximum oxygen consumption (VO2max), the time of the test and the time of the anaerobic threshold (p<0.05), which, against the background of a statistically significant decrease in lactate levels (p=0.014) indicates an improvement in aerobic performance and the possibility of faster recovery of athletes after physical exertion compared with athletes who did not receive metabolic therapy with succinic acid. Conclusion: The results obtained allow us to recommend the use of step therapy with succinic acid as a metabolic therapy for professional hockey players in the preparatory period.