In which method can essential oils not generally be used?

Essential oils are concentrated plant extracts that can be employed in various ways in aromatherapy. Among the listed methods, internal ingestion without guidance is generally considered inappropriate and potentially unsafe. This is because essential oils are highly potent substances that can have strong effects on the body, and their ingestion should be approached with caution.

Using essential oils internally should always be done under the guidance of a qualified practitioner who can assess the safety and appropriateness of doing so based on an individual's health conditions and the specific oils being used. The training provided in aromatherapy typically emphasizes the importance of safety guidelines and protocols, including the risks of toxicity and interactions that could arise from ingesting essential oils without professional oversight.

Inhalation, topical application, and bathtub preparations are all accepted methods of utilizing essential oils in a safe and beneficial manner when proper precautions are taken. Each of these methods has its own set of guidelines for dilution and usage that help ensure they can be enjoyed without adverse effects.