Sanlu was one of China 's leading dairy producers . Some Chinese dairy plants added sodium to milk products to increase protein levels . Ingesting sodium can lead to kidney stones , eye and skin irritation , some fatal . Official : Melamine was found in nearly 70 milk samples from more than 20 countries .
Sanlu was one of China 's leading dairy producers . Some Chinese dairy plants added melamine to milk products to boost protein levels . Ingesting melamine can lead to kidney stones , eye and skin irritation , experts say . Official : Melamine was found in nearly 70 milk products from more than 20 firms .