Fennel (Foeniculum vulgare) – With its natural antiseptic and astringent properties, fennel oil is ideal for oily and mature skin. Fennel oil is an effective toner and cleanser, so it can be used to correct oily skin and diminish the appearance of fine lines and wrinkles. It boosts circulation to the skin’s surface, which can limit the effects of water retention. Native to the Mediterranean, fennel was popular in ancient times and was cultivated by the Romans for its delicious fruits and succulent shoots.