Since herbs are food, there are generally no dangerous side effects of using them in there natural state. If they are herbal extracts, they are more potent then the raw herb and should be taken in smaller doses to get the desired effects. Some herbs have a cleansing and detoxifying effect on the body and can cause diarrhea and nausea if taken in large quantity. Don’t worry. It’s good to cleanse the body of toxins. Just start off slowly and you’ll get the best long term results.
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.