Nature endows us with a treasure chest of green gold full of amazing redox-active substances that interfere with numerous biological processes in our own body, in animals, bacteria, fungi, and plants. While such natural products are all around and also within us, we still do not fully understand how these compounds actually work. This book attempts to resolve some of the mysteries and riddles associated with these products. Written by more than thirty international experts from academia and industry, it focuses on modern developments in this field and considers these natural products from various angles, from their isolation and characterization to product development and commercialization. Throughout, the reader will encounter modern approaches that enable the efficient identification and isolation of new natural products, helping to elucidate their modes of action.