Introduction: sports supplements (SS) are widely used by all types of athletes to improve their performance. These SS are classified according to the ABCD system of the Australian Institute of Sports (AIS) from higher to lower scientific evidence. In mountain runners, their use could be necessary due to the physiological demands required by this sport. However, the literature on the use of SS by mountain runners is scarce. Objective: to analyze the pattern of SS consumption in mountain runners by studying differences according to sex and competitive level (regional vs national). Methodology: this was a descriptive and cross-sectional study on the consumption and use of SS by mountain runners participating in the Alcoy Solidarity Trail. Data were collected through a validated questionnaire based on content, applicability, structure, and presentation. This questionnaire was completed online by the athletes, who could fill it out voluntarily and at their convenience, as well as anonymously. Results: the results showed that 87.5 % of participants reported consuming SS, with no significant differences observed with respect to competitive level, although differences were found with respect to sex (92.7 % in men vs 70.6 % in women; p = 0.029), with a higher consumption found in men compared to women. The most consumed SS were sports bars (81.9 %), sports drinks (75.0 %), caffeine (48.6 %), magnesium (38.9 %), and electrolytes (27.8 %). Conclusions: among mountain runners consumption of SS is high, and 4 of the 5 most habitually consumed SS belong in the category of greater scientific evidence.
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