When we decide to carry a product we use our contacts and industry resources to search for suppliers. Once we compile a list we begin the vetting process. From the most reputable we request samples. If the samples pass verification we request additional samples. If the samples are consistent we make a larger order.
Once we receive a raw material we quarantine it and evaluate it organoleptically. If it appears free of adulteration and contamination we send a sample to an accredited independent third party lab for analysis. Our analytical methods are derived from the scientific literature where possible or else developed by PhDs in analytical and organic chemistry. If the lab reports match our specifications we OK the product for production.
If any of that process fails we start all over.