iKOU Essential Oils are suitable for use in an Oil Burner or Diffuser, and can be blended 8 drops of essential oil to 20 ml carrier oil for use on the skin or into a hot bath. All iKOU Essential Oils are safe in pregnancy (on the skin) except for Australian Rainforest. (Which can be used in an oil burner) Rest- -Lavender, Marjoram & Orange HOW TO USE: Diffuse in an iKOU Ultrasonic Aromatherapy Oil Diffuser. Add desired amount of oil drops to water in diffuser chamber. Can also dilute into a base carrier oil to apply to skin for aromatherapy benefits or massage.