ECO. Modern Essentials Happiness blend aims to brighten any day. This essential oil concoction features lime, sweet orange, geranium, rosemary, ylang ylang, and vanilla. Diffuse five to six drops of this beautiful mix of floral and citrus scents to help create a pleasant, feel-good environment. The Happiness blend activates areas of the brain associated with positive emotions. It may promote a pleasant emotional state of feeling good and feeling satisfied.