Histological study for the biological effect of Rosemary Rosmarinus officinalis L. essential oil on liver and kidney tissues

Many herbs and plant extracts are added to the diet not only for their aromatic properties but they possess an important biological activity. The aim of the present investigation is to examine the biological activities (describes the beneficial or adverse effects of a drug and materials on living matter) of rosemary essential oil on liver and kidney tissues. The tissues treated with different doses of essential oil of rosemary (100, 200, 300, 400) ml. Histological examination of liver tissue treated with 400 ml of rosemary revealed normal architecture with rate of stimulating cells more than the other concentrations, without dilated and congested of portal vein.