Aromatherapy should just be EO, after all that is what aromatherapy is all about. You will not achieve the desired effect of aromatherapy with FO and this can be misleading to the customer. I recommend that if you have an aromatherapy line that it is only EO, after all these are what cause the benefits in aromatherapy. I am amazed that people sell candles with FO and call them aromatherapy because there is nothing aromatherapy about it!!! You can't use FO for an aromatherapy massage!! With regards spa fragrances, you can use anything FO or EO