Ground cinnamon is very safe, the volatile oils can however cause a skin rash. Small amounts of coumarin can be found in Cassia and other cinnamons, generally only large doses of this compound will cause blood-thinning and liver problems, but it's something to be aware of. Also if you're planning on having surgery you should stop the use of cinnamon at least one week before going in as it has a blood thinning effect. You should also take care to monitor your blood sugar to avoid an unsafe drop in blood pressure.
The dandelion is often thought of as a weed due to the fact that it can very easily over run a yard and choke out grass. Dandelions are actually a great herb, they offer plenty of nutritional benefits as well as medicinal, which is why it makes our list of herbs. One great thing about the dandelion herb is that the whole plant can be used from the flower down to the roots. The leaves make a great addition to salads and the flowers (when still yellow) can be eaten raw, cooked or made into a dandelion wine. Even the root of the dandelion can be consumed, usually it is roasted and ate or added to a nice cup of tea. Due to it's good diuretic properties dandelion is also sometimes called piss-a-bed.
Teas are a great way to get the benefits of sage all you need to do is steep one teaspoon of sage in a cup of water for about 10 minutes. You can also make a pretty awesome sore throat reliever by combining sage and thyme. Take an ounce of both grind them, and cover them with 16 ounces of apple cider vinegar. Be sure to shake it periodically and let it sit for ten days before using.