Essential oils are good and bad for human body. In terms of benefits, essential oil can help people relax, improve the quality of sleep and relieve stress and anxiety. This is because essential oil contains many aromatic components, which can directly affect people's nervous system. For example, lavender essential oil can enter the human body through the nasal cavity, stimulating the cerebral cortex to release soothing chemicals, thus playing a calming and anti-tension role.

Essential oils can also be used to treat some diseases. For example, eucalyptus essential oil can be used to treat respiratory tract infections; Rosemary essential oil can relieve headaches and indigestion.

However, essential oils also have some disadvantages. Because essential oil is volatile and has a high concentration, it must be used with care. If used improperly, it may cause skin allergy or other side effects. Some essential oils may interact with some drugs and cause adverse reactions.

Long-term use of some essential oils may also lead to drug tolerance, thus reducing the therapeutic effect. Therefore, when using essential oils, we must understand their safety and side effects and use them under the guidance of doctors or professionals.

Essential oil has both advantages and disadvantages for human body. When using essential oil, you must pay attention to safety, follow the correct usage and dosage, and consult professional advice when necessary. If we can use essential oils correctly, they can become a powerful tool for our daily health care and treatment of diseases.