What is opo in Ilikin's crown protection?

To put it bluntly, OPO is an element to prevent baby constipation. My baby is often angry, and when he is angry, he becomes constipated. Every time he looks at his stool, his face turns red and he is very distressed. Later, I asked many elderly mothers, and he suggested that I change the money into milk powder containing OPO for my baby to absorb and digest. So i query bought a lot of materials and finally chose Ilikin to take care of the baby. It contains OPO ingredients, which can effectively prevent the baby from constipation due to fire. Moreover, Yili Dolly Guanzhenhu also contains the innovative protein combination of China patent formula α+β, which is helpful for nutrient absorption. Since eating this milk powder, the baby's constipation has eased and his weight has increased a lot.