E. Aryakia
ABSTRACT Medicinal plants have been integral to treating illnesses since antiquity, with their use expanding significantly in modern times. Ensuring the high quality of these resources is crucial, as various factors that inevitably influence the processing of these plants can significantly affect the therapeutic properties of the final products. This article therefore surveys those factors, first considering those associated with plant chemovariation during the preharvest phase—driven by genetics and environment—and their impact on the phytochemical and phytopharmacological properties. Key postharvest steps are then discussed: pre‐drying treatments (chemical and thermal) to deactivate enzymes and improve drying efficiency, followed by natural and mechanical drying methods chosen to enhance phytochemical stability and shelf life. Proper sorting and storage methods are emphasized as essential to eliminate contaminants and prevent deterioration. Finally, the study compares conventional and advanced techniques for extraction, separation, and purification, evaluating their yield, selectivity, and scalability. By integrating recent laboratory findings with cutting‐edge industrial practices, the paper outlines technological pathways that can raise quality standards across the medicinal‐plant value chain and support the production of safe, high‐quality herbal end‐products.