Wintergreen oil is an essential oil extracted from the leaves of the wintergreen plant, also known as Gaultheria procumbens. It has a strong, refreshing, and minty aroma. It is known for its pain-relieving properties, and has been traditionally used to help with muscle pain, headaches, and arthritis. Wintergreen oil is also believed to have anti-inflammatory properties, which may make it useful for treating certain skin conditions. Wintergreen oil is typically used in aromatherapy, massage, and traditional medicine. it's also used as a flavoring agent in some food and beverages. It is considered safe for most people when used topically in small amounts, but it's always best to do a patch test before using it and to consult with a healthcare professional before using it internally, as large doses can cause skin irritation, and other adverse effects.