In the experiment, the positive effect of mixture of Eurycoma longifolia, Tribulus terrestris and Leuzea carthamoides extract on reproduction functions of boars was detected. Likewise, the significant improving of libido sexualis was registered. The herbal extract had no negative effect on quality of ejaculate, except occurrence of morphologically abnormal spermatozoa which was higher. The concentration of free amino acids in seminal plasma was improved.