Unveiling the Therapeutic Arsenal of Cassia fistula L.: Traditional Wisdom to Modern Biomedical Applications

Cassia fistula L., widely known as the golden shower tree, has been deeply rooted in traditional medicine systems for centuries and is now emerging as a potential candidate in modern pharmacotherapy. This review comprehensively explores the phytochemical, pharmacological, and nanotechnological dimensions of C. fistula, synthesizing recent preclinical and in vitro evidence. The plant exhibits a broad spectrum of therapeutic properties, including antioxidant, anti-inflammatory, antidiabetic, hepatoprotective, antimicrobial, and anticancer activities—largely attributed to key phytoconstituents such as rhein, emodin, quercetin, and kaempferol. Advances in green nanotechnology have further enhanced its biomedical relevance, with silver and gold nanoparticles synthesized from C. fistula extracts demonstrating increased cytotoxicity, bioavailability, and targeted delivery. While traditional usage and animal studies suggest a favorable safety profile, data on reproductive toxicity, nanotoxicity, and human clinical trials remain limited. Regulatory challenges, including phytochemical standardization, dose optimization, and formulation consistency, must be addressed to ensure safe translation from bench to bedside. Future research should prioritize clinical validation, sustainable sourcing, and mechanistic insights into molecular pathways to fully realize the therapeutic potential of Cassia fistula in integrated healthcare systems. Keywords: Cassia fistula; Phytochemicals; Nanotechnology; Pharmacological activities; Traditional medicine.