Lemon is a rejuvenating, clean-smelling essential oil that is commonly used to enhance concentration and energy. It has a calming effect that can subdue negative moods such as anxiety. Lavender is known as a mild sedative and is reputed to reduce stress by relaxing the brain waves. Lavender supports the immune system by helping relieve feelings of stress that can weaken health. It is believed to help balance hormones, to reduce feelings of nervous tension, and based on empirical evidence, has worked to reduce feelings of depression for some individuals.