Raw garlic is simply the best form of the herb to eat, when you cook garlic you destroy a lot of the constituents responsible for its medicinal properties. Aside from eating garlic raw you can also crush up a few cloves of garlic and add it too some olive oil which can then be put on a salad. You can also purchase garlic capsules these are a great way to get the main constituents of garlic into your body. Try and look for products containing allicin this is one of the top ingredients found in garlic.
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.