This book explores the pharmacognosy, the scientific study of drugs from natural sources. The term combines the Greek words for "drug" and "knowledge," reflecting its rich historical and scientific heritage. Pharmacognosy connects traditional knowledge and modern science, covering the chemistry, botany, and therapeutic applications of natural substances. The field's relevance extends beyond academia, embodying the relationship between nature and health. This book delves into the medicinal, toxic, and nutritional aspects of natural products like Hibiscus sabdariffa and the Pomelo fruit, alongside innovative extraction methods that enhance their purity and efficacy. Readers will gain insights into both the historical uses and cutting-edge scientific research of plant-based medicines, understanding their potential in treating diseases and advancing future discoveries. This book provides a comprehensive look at the past, present, and future of pharmacognosy, bridging ancient wisdom with modern scientific developments.