This Cinnamon Bark is a natural flavoring. However, Cinnamon Bark, and it's cousin Cassia, are dermal toxic. This means that it will BURN if you put it directly on your skin.
Usually the rash goes away after a while with no ill side effects, but it isn't pleasant to have. The Our Blends that have Cinnamon Bark in them have a very, very small amount, but it would be wise to test them on a non-sensitive place before using them on your skin. Some people are more sensitive than others. We would NEVER recommend using Cinnamon Bark straight, but some people are not bothered by using Leo, Sun or Fire.