Studies, such as one conducted at Penn State College of Medicine, have found that honey can work more efficiently to calm a cough than over-the-counter drugs. It is a rich demulcent, with a high viscosity and stickiness that does an incredible job of coating and soothing those irritated mucous membranes. Thanks to an enzyme added by bees when they harvest honey, it also has antibacterial properties as well, which may help shorten how long you have the cough if it is due to bacterial illness.
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.