Our hazelnut base oils are ideal for diluting essential oils before using them on the skin. All of our base oils are 100% natural pure oil. The common hazelnut is grown throughout the European and Asian continent and beyond. It is grown primarily for walnuts, but has also been used in Britain and Europe as hedges on farmland for hundreds of years. The use of hazelnuts dates back at least 9000 years with archaeological evidence of massive processing of hazelnuts at various locations in the British Isles. In cosmetics, the oil is nourishing for the skin with some astringent properties.