Our Horny Goat Weed Extract contains a super high-potency extract of Epimedium Grandiflorum standardized for 10:1 Stem concentration and is lab tested for potency and purity. In order to provide consistency in quality, all of our products undergo following tests: Assay with HPLC / Titration / Gravimetry, Residual Solvent Analysis with GC-HS, Heavy Metal Testing with AAS, Microbiology Analysis, Impurity Profiling and Stability testingHIGHEST PURITY: Our products contain zero magnesium stearate, synthetic ingredients, dioxides, anti-caking agents, preservatives, colors or flavors. There are zero unnatural potentially harmful synthetic or artificial ingredients of any kind. NON SYNTHETIC: This product contains zero synthetic ingredients. It is sourced and made from real plant material and contains zero lab made or synthetic ingredients. 100% REAL HERBS!