QC is the part of GMP that deals with sampling, specification and testing, and organization, documentation and release procedures that ensure that necessary and relevant tests are actually carried out and that materials are not released for use, or products are released. no sale or supply, so long as their quality is judged to be satisfactory. QC is not limited to laboratory operations, but can be involved in many decisions related to product quality. QC establishes, verifies and implements all QC procedures, evaluates, maintains and preserves reference standards for substances, to ensure proper labeling of materials and product containers, active pharmaceutical ingredients (APIs) and products are monitored to ensure stability, product quality complaints To participate in investigations and participate in environmental monitoring.