Essential oils are widely used to prevent various diseases. It has been shown to stimulate the brain - they increase cognitive function and improve mood. Aromatherapy is also applied to the treatment of muscle stiffness, skin irritation, headache, problems with sexual function, sleep disturbances, stress, anxiety, depression and other nervous disorders. Essential oils possess proven antibacterial and antiviral properties and are therefore used in the treatment of various infectious diseases transmitted by air-droplet. Some of the oils are even able to reduce the amount of Micrococcus luteus to 82%, Pseudomonas aeruginosa to 96%, and Staphylococcus aureus to 44%.