Like I said, I love science; it is not our enemy. While I believe nature knows best, and formulate with that belief in mind, sometimes science and chemistry are our friends. Some brilliant chemists who have great respect for the natural world have worked hard to formulate some ingredients that increase the safety of our skin care products. I would never sell a product that could potentially grow bacteria or mold because I care deeply about the safety of our customers. For this reason I have put many many hours into searching out safe, effective, and responsibly made preservatives to use in my water based products. Whatever your skin care philosophy please don't use a product that has water based ingredients without a preservative included.