Cleaner Processes, Safer Products: Environmental and Public Health Pathways for Chinese Herbal Medicine

Chinese Herbal Medicines (CHMs) are at the crossroads of therapeutic practice, agricultural biodiversity, industrial production, and health. Traditional methods of CHM production, such as decoction, solvent extraction, evaporation, and purification, can be efficient but can use large amounts of water and organic solvents, use a lot of thermal energy, and repeat concentration processes. These liabilities are not limited to environmental issues but can also impact occupational exposure, emissions in the nearby communities, quality of pharmaceuticals, transfer of contaminants, and affordability and stability of herbal products. This narrative review assesses green extraction and concentration technologies that can be used in CHM production, such as Pressurized Liquid Extraction (PLE), subcritical water extraction, supercritical carbon dioxide extraction, ultrasound-assisted extraction, microwave-assisted extraction, natural deep eutectic solvents, membrane-based processes, and intensified low-temperature concentration. The main point is that a process cannot be regarded as green just because it utilizes a specific solvent or has a high extraction yield. An assessment that is public-health-oriented should be able to evaluate life-cycle burdens, contaminant fate, chemical safety, batch-to-batch reproducibility, pharmacological integrity, worker protection, and accessibility. Studies indexed in PubMed indicate that increased extraction may decrease processing time and solvent usage. Subcritical water and supercritical CO2 can also be beneficial in solvent recovery and residual-solvent control, especially in the case of selected chemical classes. Nevertheless, ionic liquids and certain deep eutectic solvents should be carefully evaluated in terms of toxicology, and their end-of-life management should be scrutinized. In addition, the processes of concentration can not only enrich the desired constituents but also dangerous elements. Sustainable production thus demands a systems-based route that includes verified and traceable raw materials, contaminant-informed process design, green chemistry metrics, life-cycle assessment, validated multi-marker quality control, safer solvent recovery, and health-impact monitoring. This review outlines the main research gaps and suggests a translational model to connect process innovation with environmental health and global public health objectives.