Citrus limon is native to Asia and is thought to be a hybrid of citron (C. medica) and pomelo (C. maxima).[1] The fresh, optimistic aroma is instantly recognizable, like seeing a familiar face in a crowd of strangers. These very personal associations may create impressions that last a lifetime and influence use. The aroma of Lemon is widely used in perfumes, cosmetics, soaps and household products.[2] It is wonderful to use in a diffuser while studying or to smell during long drives. Please use Lemon oil on the skin with caution and in low dilution due to the phototoxic effect of citrus oils; cold pressed citrus oils, such as lemon, tend to have a higher risk of phototoxicity than steam distilled citrus oils.