We always advise to only use 100% natural essential oils. One of the essential oils that are safe to use are from Young Living and DoTerra. We also produce our own natural 100% pure essential oils (also available on our website). Other blends and oils may contain fragrances, base oils or synthetics that could result in malfunction.
Many single note essential oils should not be used in the ultrasonic diffuser. Single note essential oils may have a thick or heavy consistency that can clog the ultrasonic diffuser and cause it to stop working.
Happyhaves essential oils have been carefully produced to be effective for you, and safe and easy to use in your ultrasonic diffuser.