How Aromatherapy Works Essential oils have a very powerful effect on the body and mind. It takes approximately four seconds for an essential oil to reach the brain through the sense of smell and four minutes to be absorbed into the blood stream through the skin. Essential oils have an affinity with the skin’s natural oils allowing this rapid absorption. They enter and leave the body very efficiently leaving no toxic residue behind. They are excreted through the normal bodily functions. Benefits Essential oils have a very positive effect on blood circulation playing an important part in bringing nutrients and oxygen to the tissues and stimulating the lymphatic system to dispose of waste products. Essential oils also help stimulate the immune system. What is the Difference Between Essential, Fragrant and Perfume Oils? Essential oils should never be confused with fragrant or perfume oils, which are not pure manufactured extracts and do not have the same therapeutic value. A Complete Guide to Aromatherapy