Refreshing and cleansing. Eucalyptus oil is known for its ability to settle both physical and mental ailments. Congestion, asthma and other sinus issues, joint pain, mental sluggishness, and low mental outlooks are a handful of benefits that can be relieved by Eucalyptus oil. Can be used in a diffuser, or applied to the skin! Be careful never to apply essential oils directly to your skin, always use a carrier agent like coconut oil or mineral oil.