Yes they do. The Bliss Healing Balm contains certified organic non-GMO Vitamin E as the only preservative. The Acne Healing Extract contains ethanol which acts as a preservative. Our moisturisers, which contain both oil and water, need a safe preservative to effectively inhibit the growth of mould, fungi, bacteria and yeast. We use a formula that the Soil Association, UK’s leading organic certifier allows in certified organic products. The formula includes a mixture of Benzyl Alcohol, Phenoxyethanol, Potassium sorbate and Vitamin E. All the ingredients in this mixture rate low on EWG (Environmental Working Group) Skin Deep hazard score for cosmetics. We uses less of the preservative mixture than recommended in our moisturisers since various herbs also act as preservatives.