I had a serious cold which turned into a sinus infection for over 3 weeks. I tried the eucalyptus, thyme and peppermint oils in steam pot and I was better in two days. Now I use them every time I start to feel a cold coming on and they prevent me from getting sick again. Not to mention that the smell of the 3 oils together is wonderful. I even put them in the pot of water on my wood burning stove so the whole house is invigorating.