While you could definitely use only essential or natural oils in soy wax candles, simply put, they do not produce enough of a strong hot or cold scent throw. It would require a far greater ratio of oil to wax to achieve a scent, therefore also significantly increasing the price of the candle. To achieve a good scent throw while remaining non-toxic, we've decided to use paraben and phthalete-free fragrance oils in the majority of our candles. We do feature some candles with a mix of natural oils and paraben and phthalete-free fragrance oils.