2. Dairy products are the best choice for calcium supplements. Cheese is a dairy product with the most calcium, which is easily absorbed. As far as calcium content is concerned, 250 ml milk =200 ml yogurt =40 g cheese. The higher the water content of cheese sticks, the easier it is to deteriorate and rot. Cheese sticks should be packed in oxygen-proof packaging. If vacuum and sealed packaging filled with inert protective gas are used, its protection effect will be better.