Sereyn, produced by BioNeurix Corporation, is marketed as a natural remedy used to treat anxiety, stress and insomnia. Utilizing 3 active ingredients, including two plant extracts and an amino acid, the makers claim to be able to reduce the symptoms of chronic anxiety, stress and fatigue. The product is a counterpart to another produced by the same company, Amoryn, which is aimed more towards patients who are seeking relief from depression, as well as anxiety. The makers claim it is safe to use both remedies at the same time. Because both Seredyn and Amoryn are natural remedies derived from plants, neither products are FDA approved, and are available without a prescription.