Bring enough water to a boil to halfway fill a medium size-heat proof bowl. Pour the water into it, let it cool slightly for 30-60 seconds, and add the essential oils, giving it a quick stir to release the vapors. Lean over the bowl and get as close as you can while still being comfortable. Remember that steam can seriously burn! Use the towel to cover your head like a tent, trapping the steam, and breathe deeply. Ideally, do this for 5-10 minutes 2-3 times a day.
Another well know spice in the kitchen cinnamon is also known for it's medicinal properties. While not really an herb I still think it's important to list it in our list of herbs and their uses. Cinnamon actually comes from the inner bark of a tree in the laurel family. It's been used for centuries and was a hot commodity for trade in ancient times. In fact during the first century A.D. in Rome cinnamon was 15 times more expensive than silver. The Chinese were probably the first to use cinnamon as a medicinal herb and used it to treat fevers, and diarrhea. In more modern times cinnamon has been found to stabilize blood sugar levels in diabetics, as it has an insulin kind of effect.