This means these have been carried with another non scented oil so will not harm the skin. For oils with no carrier go to therapeutic oil section on our page. In most cases if your are applying directly to skin (exception being feet)this what your using oils in this section. Most company's choose not to make you aware you that can they can add another essential oil so you don't get skin irritations as its still a pure essential oil. If wearing it directly on the skin its been carried. We at Rainbow Sky choose to make you aware of how the market works. For essential in the purest form go to our therapeutic oil section where you find some purest, strongest and finest oils on the market today. These are great to wear, candles, soaps, incense and tea light candle diffusers..