What probiotics are useful for functional constipation?

I also had this problem for a while, which was quite uncomfortable. Later, I took Leven's PRO-CR probiotics under the doctor's recommendation. It is said that it is a brand from the Netherlands, which adopts patented biological activity technology, can be stored at room temperature for two years, has good stability and can adapt to the intestinal environment. After oral administration, it can also maintain the metabolic activity in the intestine. I have used it for a while now, and my constipation has been much better.