Hplc testing of pharmaceuticals

I would like to hire a professional who can confirm the quality of various pharmaceuticals and research chemicals to act as a third party lab testing partner. We buy our products from various suppliers and need to confirm that the products are indeed accurate and pure. Products vary greatly. But some examples are SARMS, SERMS, and plant based extracts, etc. I also need the person for hire to be located in the United States so that it is quick and affordable to get the products to you. You must have good experience in hplc testing, Chromatograms, and other testing methods.