Essential oils are safe and easy to use. However, it is important to remember that therapeutic grade essential oils are highly concentrated plant extracts. They should be used with reasonable care.
The most important safety guideline or responsible caution when using essential oils is to use high quality, therapeutic grade essential oils. You want oils that have been tested for both potency and impurities.
Using an inferior oil or one that is synthetic can cause harmful reactions, and may not provide the same therapeutic benefit you are hoping for.
Here are a few additional safety guidelines when using essential oils.