Herb-Induced Liver Injury

Herb-induced liver injury (HILI) is an increasingly recognized cause of liver damage, associated with the widespread global use of herbal products. Despite its rising incidence, HILI remains underrecognized and underreported due to the absence of specific biomarkers, limited regulatory oversight, and the complexity of multi-ingredient formulations. Diagnostic efforts rely heavily on the Roussel Uclaf Causality Assessment Method (RUCAM), with clinical presentations often nonspecific and dominated by hepatocellular patterns of injury. Epidemiological data demonstrate regional variation, with notably higher case numbers in Asia and the Americas. Mechanistically, HILI may result from either intrinsic (predictable, dose-dependent) or idiosyncratic (unpredictable, immune-mediated) reactions. Genetic predispositions, including certain HLA alleles, have been identified as risk factors. Hepatotoxicity is often linked to specific phytochemicals such as pyrrolizidine alkaloids, catechins, anthraquinones, and diterpenoids, which may contribute to oxidative stress, mitochondrial damage, or immune activation. Additionally, product inconsistencies and contamination complicate risk assessment and safety evaluation. Current management focuses on immediate discontinuation of the suspected product and supportive care, though severe cases may require liver transplantation. Future directions include the development of specific diagnostic tools, implementation of globally harmonized regulatory standards, improved pharmacovigilance systems, and enhanced public and professional education. Addressing these priorities is crucial for reducing HILI-related morbidity while supporting the safe use of herbal therapies.