Essential Oils are the aromatic volitile oils found naturally in plants. The most common method of extracting the essential oils from the herb is by steam distillation. All of our Essential Oils are in their pure and concentrated form (no carrier oils are added) and as such should be used with care. The oils are fine to use in your Pixie Aromatherapy Products without the need to dilute them, but if you intend to use them topically they should be diluted appropriately. Special care should be taken if using any essential oils when pregnant or epileptic.