This book deals with the noteworthy advancement in the production of bioactive metabolites from microbes and their pharmacological significance. It highlights the pharmacological potential of marine microbes and endophytic fungi and their bioactive secondary metabolites. Emphasis is also given on the significance of probiotics and their specialized molecules in human health and disease as well as their role in dietary intervention for reducing the risk of non-alcoholic fatty liver disease. This work also serves as excellent reference material for researchers, students and academicians in the field of natural product chemistry, pharmacology and applied microbiology.