Natural product chemistry continues to present opportunities for medicinal chemists to discover new bioactive compounds against various diseases. Even in cases where the structures are too complex to be obtained on a large scale from natural resources. My intention with this book to not only provide insights into the sources that may be used to discover new natural products based drugs but also to stress chemical methods used for the qualitative and quantitative analysis of medicinal principles. This book contains judicious combination of chemical and chromatographic techniques used for the analysis of bioactive ingredients. Moreover this book provides a balanced view of pharmacological activities that are frequently carried out in natural product chemistry. Therefore this book can benefit various newly enrolled scholars through out the world.