This book focuses on probiotics and gut microbiota, as well as their roles in alleviating the toxicity of various environmental pollutants, presenting the latest research findings and explaining advanced research methods and tools. At the same time, it offers suggestions for future research directions. Further, the book introduces readers to the concept of gut remediation, a potential approach to reducing environmental-pollutant toxicity in vivo, based on modulation of gut microbiota using probiotic supplements. Lastly it provides suggestions for further reading.