Chemical Signatures of the Brain bridges biochemistry, neuroanatomy, and neuroscience to illuminate the molecular foundations of brain disorders. This interdisciplinary volume explores neurotransmitter systems, neuropeptides, lipid signalling, and energy metabolism, offering insights into the biochemical pathways that shape cognition, behaviour, and disease. With chapters authored by global experts, the book examines oxidative stress, neuroinflammation, epigenetics, and environmental influences, highlighting emerging biomarkers and therapeutic strategies for neuropsychiatric and neurodegenerative conditions. Designed for researchers, clinicians, and students, it delivers a comprehensive yet focused resource that integrates foundational science with translational relevance. Whether investigating Alzheimer's, Parkinson's, or depression, readers will gain a deeper understanding of the brain's chemical architecture and its implications for precision medicine.