Can you tell me what ingredient or ingredients are the preservative?

Due to being oil-based and not containing any water, our Skin Nutrients 4-in-1 Cleanse is free of any synthetic preservatives, as it is unable to develop bacteria. We would therefore advise you to keep the jar free of water - for example, not using wet hands to scoop out the product. It also contains Vitamin E, a natural antioxidant, which helps to prolong its shelf life.