Store-bought dehydrated apricots are preserved with sulfur dioxide. Organic dried apricots don't contain this preservative. The brighter dried apricots are, the more they will contain sulfur dioxide. Some people, especially those with a story of asthma, are sensitive to this chemical. Brands have to disclose on the labels if they added this substance to their dried fruits but the law usually doesn't state the concentration. So, this is why it's better to either buy organic apricots or to dehydrate your own apricots.