It is high-tech product developed by PFL research institute based on the actuality that pets lack of calcium, ferrum and zinc, and it presses the compound of calcium, ferrum, zinc and vitamin D3, milk, yeast and glucose into pilis, which are easy to chew for pets. As auxiliary nutrient for pets' development, it can help pets build strong bones and improve immunity. Usage: Two pills per day for small dogs and cats, four pills per day for medium-sized dogs, eight pills per day for large-sized dogs.