Expiration dates on each lot of ingredient were checked. Each ingredient was analyzed by HPLC (high-performance liquid chromatography) to identify the quantity and purity of each component of the ingredient. Specific assays were used to measure the active ingredient. Microbiology testing was also performed, as well as tests for heavy metals and other contaminants. Small overages of each ingredient were added during manufacture to ensure that capsules were not shorted due to incomplete mixing.