This product is a freeze-dried powder of selected high-quality Lactobacillus delbrueckii subsp. bulgaricus, processed through a freeze-drying technique. The excipients include the culture medium and protective agents for the bacteria. The product is in powder form, free of visible impurities to the naked eye, and has a color ranging from white to light yellow. It can be widely used in food, dairy products, and functional health supplements.