These steamers are packed with menthol crystals ( Peppermint) Lavender and Eucalyptus! If you are congested drop one of these in they shower floor or hang so they get wet but not under direct water. The steamer will slowly start to fizz and release the sinus opening menthol and essential oils.
Recommend using only 1/2. Menthol may cause slight eye irritation. Do not use with children. Do not use if pregnant.