Deproteinized whey consists largely of lactose and essential minerals, widely employed in animal feed, sweeteners, and baby formula. Its nutrient profile makes it desirable where minimal protein is needed. Producers target markets requiring dietary clarity and functionality. Innovations in membrane filtration enhance output quality. Applications span processed snacks, nutritional bars, and oral pharmaceuticals. Consumers favor transparency, promoting clear labeling and traceability. Regional adoption differs by dietary habits, regulations, and infrastructure. Efficiency improvements lower production costs. As sustainability becomes critical, manufacturers implement energy-saving methods. The market benefits from cross-industry collaboration, with growing emphasis on health, eco-consciousness, and supply stability.