Abstract: Garlic contains more than 200 chemicals. It contains sulfur compounds (allicin, alliin and agoene), volatile oils, enzymes (allinase, peroxidase and miracynase), carbohydrates (sucrose and glucose), and minerals (selenium). It also contains amino acids (cysteine, glutamine, isoleucine and methionine), which help to protect cells from the harms of free radicals, bioflavonoids (quercetin and cyanidin, allistatin I and allistatin II and vitamins C, E and A), which help to protect us from oxidation agents and free radicals. Results indicated that treatment withgarlic caused significant (P<0.05) increase in body weight (BW) and relative weight of, brine, testes,testosterone, T3 and T4. While, decrease the levels of FSH, LH, estradiol and progesterone in plasma compared to control animals.