100% Natural Overnight Cold Therapy Oil ingredients: Olive oil, eucalyptus essential oil, tea tree essential oil, peppermint essential oil, rosemary essential oil, castor oil.  Each ingredient is used as an immune booster as you sleep.  Essential oils have been in use for hundreds of years to support health and healing.  *Please test a small amount first to make sure you do not have a sensitivity to any of the ingredients.  Also, the oil may stain, so wear old t-shirts or cover with a light towel while sleeping.  I also recommend to put on the bottom of your feet before you sleep and cover with some warm, cozy socks.