The manufacture of essential oils according to are now safer due to health and safety standards that have been set by government agencies. It is safer and reliable to use essential oils because these are now prepared under strict adherence to these standards which are also widely observed by other countries all over the world. The point is, essential oils that have been avoided due to potential side effects and complications are now diluted and prepared according to the type of application that you may want to use these pure botanical essences.
In olden times, people are wary about using pure essential oils which are undiluted because of its strong effects which could cause skin irritations and other health issues. Naturally, the pure and undiluted essence of a plant may still contain compounds which could cause detrimental side effects due to some plant toxins. However, if these essences are prepared according to safety and health standards, these are definitely safe to use whether used in culinary preparations or in aromatherapy. But it would also be helpful to know which types of essential oils are safe to use for cooking, aromatherapy, or topical application. Always read the label and go for diluted solutions that have been filtered and watered down for safe application.