While some essential oils are ok to be used neat (i.e., applying the oil undiluted), it’s generally a good idea to dilute your essential oils with a carrier oil. A carrier oil is any kind of nut or vegetable oil that you add to your essential oils before applying them onto your skin. A carrier oil helps to “carry” the essential oil into the body. Common carrier oils include coconut, almond, jojoba, grapeseed, or olive oil. Each of these have different characteristics, but the most shelf-stable carrier oil is coconut oil. Shelf stability is important because you don’t want your carrier oil going rancid with your beautiful dōTERRA essential oils inside of it! While you can use the coconut oil that you probably have in your pantry, if you want to make rollers that stay in liquid form for easy application, you’ll want to grab Fractionated Coconut Oil. Fractionated simply means that the fatty acids from the triglycerides are separated off so that the oil retains the liquid state.