One of the brightest citrus oils of the bunch, Sweet Orange is a great essential oil that holds even greater benefits. Its refreshing, juicy aroma can help cheer up any environment and boast any stale-smelling room. It can help ease nervous tension, uplift feelings of sadness and can also support normal functioning of your immune system. Dilute Sweet Orange into a carrier oil and apply it to your skin to help brighten and reduce dullness.