Contains an essential aromatic oil and a small quantity of natural anti-oxidants. Good for face masks. The British Pharmacopoeia (1988) also lists lemon peel as an aromatic for use as an aroma and flavour enhancer. The (bio-)flavonoids of the drug are reported to reduce the permeability of blood vessels, especially of capillaries, so that extracts from lemon peel are also included in remedies for phlebitis and many vitamin and mineral supplements. New studies on a monoterpene found in lemon peel called limonene show that it very effectively prevents individuals from developing abnormal growths on their skin.