The compound protein beverage of Prince Nut for middle-aged and elderly people is Hebei Oumai Biotechnology Co., Ltd. ... which is a beverage enterprise integrating R&D, production and sales. With advanced equipment, perfect management and scientific technology, the company took the lead in passing qs food quality and safety certification. Product selection is exquisite, process requirements are strict, and the factory quality is high, which is deeply loved by consumers.