Khat (Catha edulis Forsk) is a dicotyledonous evergreen shrub of the family Celastraceae that grows in parts of East Africa and Yemen. Fresh leaves and stem tips or twigs of the plant are chewed for their euphoric properties. The habit of khat chewing is increasing remarkably and its health effects are not much known to the users. The study is aimed at investigating the toxic effects of khat extract on male gonad, the testes by assessing the histological changes of the testes as well as changes in serum testosterone level and amount of glycogen in testicular tissue. The organic extract of...