Many essentials can help relieve congestion due to their astringent properties. But some of them are also considered mucolytic, meaning they make the mucous less thick, sticky, and easier to cough up. The number one essential oil for congestion is Inula, so we arranged that one at the top of this collection. The three essential oils that follow Inula are considered some of the most potent essential oils for congestion. The remaining essential oils on this list have mucolytic properties and are known to be effective, but for whatever reason, they are less popular. Shop the Best Essential Oils for Congestion!