This book explores the growing impact of metal-peptide complexes in bioinorganic chemistry and their essential role in modern biology and medicine. It examines the structure, synthesis and properties of peptides, their interaction with essential metals such as copper, zinc and iron, and their application in vital biological processes. Covering topics such as enzyme regulation, cell protection and antimicrobial treatments, the book presents concrete examples of therapeutic applications in cancer, neurodegenerative diseases and gene therapy. It also explores the technical challenges of designing selective and stable complexes, while highlighting recent advances facilitating research through artificial intelligence and molecular modeling. This book is a comprehensive resource for understanding the current challenges and future prospects of metal peptides in biomedical applications.