Nutraceuticals, which are bioactive substances obtained from food, are essential for managing chronic illnesses, preventing disease, and promoting health. This study addresses their definitions, classifications, mechanisms of action, and evidence-based advantages for neurological, gastrointestinal, immunological, metabolic, and cardiovascular health. The paper also discusses regulatory issues, safety concerns, and potential directions for nutraceutical research in the future. According to research, nutraceuticals can greatly enhance global health and supplement contemporary treatment when utilized properly.