Eucalyptus oil is a fragrant plant oil whose active ingredients are found in the leaves and in the oil obtained from them. The oil has benefits for the skin, but is also a potent skin sensitizer due to its chemical components. Truly a mixed bag, this oil, like rosemary oil, has benefits and risks. Low amounts of eucalyptus oil do not appear to pose a risk of sensitivity in the general population, but its fragrance components are known sensitizers. https://www.paulaschoice.com/ingredient-dictionary/ingredient-eucalyptus-oil.html?q=Eucalyptus%20Radiata%20Leaf%2FStem%20Oil&fdid=ingredients