This product is a serum-free medium meticulously designed for the in vitro culture of human mammary stem cells. Its scientifically formulated core components efficiently support sustained proliferation and self-renewal of stem cells, stably maintain their pluripotent characteristics and dual differentiation potential (acinar/ductal), and effectively prevent spontaneous differentiation and functional decline during culture. The medium contains clearly defined ingredients and is entirely free of animal-derived components, significantly reducing the risk of contamination by exogenous factors.