Organic origin is especially important for the citruses since they are often heavily sprayed and where does the essential oil come from? The rind! Pesticides and fungicides find their way into non-organic citrus oils in concentrations.
Do you know about phototoxicity? Our Sweet Orange and Lime are NOT phototoxic, but the others in this category are. Phototoxic oils are fine to use in low dilution on the skin (1%, 5 drops per ounce of carrier) as long as direct sunlight (natural or artificial) is avoided for 12-24 hours.