Therapeutic Potential of Onion Bioactive Compounds

The onion (Allium cepa L.) is among the most widely consumed vegetables in the world, valued for its flavor and, for millennia, for its medicinal properties. Modern science now shows that this everyday bulb is a rich source of nutrients and bioactive compounds, including organosulfur molecules and flavonoids such as quercetin. This book first presents the onion's botany, nutritional value, and phytochemical composition. It then reviews evidence for its antioxidant, antidiabetic, anti-obesity, anticancer, and bone-protective effects, together with clinical findings in metabolic syndrome. Finally, it turns to carbon nano-onions, a promising class of nanocarriers for neuro-biomedical applications. Bridging traditional knowledge and cutting-edge nanotechnology, the book is written for researchers, clinicians, students, and anyone interested in food-based therapeutics.