Pharmacognosy and Phytochemistry I is a comprehensive guide designed to provide students and professionals with a deep understanding of the fundamentals and advancements in the field of pharmacognosy. Authored by Dr. Brijesh Shivhare, this book delves into the intricate world of natural products, exploring their sources, properties, and applications in modern and traditional medicine. The text is structured to offer a seamless blend of theoretical concepts and practical insights, making it an invaluable resource for learners at various stages of their academic and professional journeys. This book begins with an exploration of the historical development of pharmacognosy, tracing its evolution from ancient practices to contemporary scientific approaches. It highlights the significance of natural products as a foundation for drug discovery and development, emphasizing their role in allopathic and traditional systems of medicine, including Ayurveda, Unani, Siddha, Homeopathy, and Chinese medicine. A key feature of this book is its detailed classification and description of drugs derived from natural sources, both organized and unorganized. It provides an in-depth analysis of secondary metabolites, including alkaloids, glycosides, flavonoids, tannins, volatile oils, and resins, offering insights into their properties, functions, and methods of identification. Quality control of natural drugs is another critical aspect covered in this text, ensuring that readers understand the importance of maintaining standards in the preparation and use of herbal medicines. The book also addresses the growing field of plant tissue culture, discussing its applications in pharmacognosy and the development of edible vaccines. Pharmacognosy and Phytochemistry I is meticulously crafted to serve as an essential reference for students, researchers, and practitioners, fostering a comprehensive understanding of the natural origins of medicinal substances and their profound impact on healthcare.