No, not all lash serums contain prostaglandins or prostaglandin analogs like bimatoprost (the magic ingredient that allows our serum to stimulate growth). Many over-the-counter lash serums instead include ingredients like peptides, vitamins, and botanical extracts to condition and strengthen lashes, rather than to stimulate growth directly. Only a few lash growth treatments, prescribed by healthcare providers or approved by the FDA, contain prostaglandin analogs like bimatoprost. At Mylash we distinguish between our growth treatment (clinically tested to work) and our conditioner (that improves hair quality to contribute to healthy growth, but that isn't proven to cause growth directly).