Our products are guaranteed to have a shelf life of one year from purchase. We fulfill each order as they are received to ensure the freshest, most potent products for you. As we do not use any chemical additives or preservatives (we use natural preservatives when necessary) we ask that you think of our serums as you would anything fresh that you buy, using them frequently and keeping them properly closed and away from extreme weather fluctuations and light to ensure the longest shelf life possible. Each 50 ml serum will last between 18–20 weeks with daily use of 6–8 drops.