The industry hasmade available in the market a series of substances (nutraceuticals) which intentwould be to optimize the use of nutrients in some metabolic paths, influencingpositively reproductive performance in animals. However, the response to theuse of nutraceuticals varies according to the animal. As the organism is highlycomplex and in order to achieve a perfect activity of the hypothalamic-pituitary-gonadalaxis, an ideal interaction in molecular basis is needed, where the nutraceuticalscan have their direct action. The aim of this study was to review the functionand research results using the main nutraceuticals (βcarotene, vitamin A, L-carnitine, omegas 3, 6 and 9 and Gamma-oryzanol) on reproductivecharacteristics of bulls and stallions.