Pure Body Naturals Highly Concentrated Peppermint Essential Oil contains metha furan.(also known as Methofuran). Peppermint essential oil gives a cooling sensation and has a calming effect on the body, which can help to also relieve sore muscles when used topically. Pure Body Naturals Peppermint Oil is highest potency with Metha Furan. Our oils are by far the most effective on the market.