Oil of Wintergreen is extracted from the leaves of a small evergreen herb that grows up to 15 cm. In late spring the plant forms small white flowers. In summer red cherry shaped berries grow and last until the following spring. The crushed leaves have a lovely medicinal smell. Traditionally Wintergreen was chewed by the natives of the Americas in order to increase lung capacity and assist in healing respiratory conditions. Early settlers chewed on Wintergreen to help prevent tooth decay. The dried leaf and stem are current in the British Herbal Pharmacopoeia as a specific for rheumatoid arthritis. It is often blended to a 10% concentration in the carrier oil of your choice, and used as an effective pain-relieving massage oil.