Abstract
INTRODUCTION: Kava is a plant-based drug central to many Pacific Island cultures, yet its physiological and psychological effects remain contested and poorly understood. Additionally, the broader social, economic, and policy consequences of kava trade and consumption are unclear. This paper systematically reviewed global literature on kava to clarify its role and potential impacts across these domains. METHODS: We conducted a systematic search of eight databases for records published between January 1980 and December 2022. Records on kava prevalence, social and cultural use, harms, benefits, economic impacts and policy reports were included. Data were narratively synthesised, combining qualitative and quantitative data extracted using a pre-designed template for each outcome, including a risk of bias evaluation. RESULTS: We included 197 records across all domains. Most prevalence records used convenience samples in populations regularly consuming kava but with varying doses and periods. The harms and benefits of kava varied; its role in liver toxicity and anxiety reduction remains unclear. However, kava's social and cultural uses in recreational and traditional contexts and its economic importance in trade, distribution and sales across Pacific Islander countries were consistently reported. DISCUSSION AND CONCLUSIONS: Kava holds social and cultural significance and is an essential trading commodity for Pacific Islander countries. Additional high-quality studies with larger samples are necessary to better inform policies and regulations around kava's usage, distribution, and its potential harms and benefits.