Very useful. I stayed at home these days and was fed by my mother. Sleep from morning till night every day, without all kinds of sweets and fruits. I have to eat four meals for dinner. Not only do I have more meat on my stomach, but my stomach is often uncomfortable. Fortunately, I still have a few boxes of witticism probiotics I bought years ago at home. Drinking a bag after lunch every day these days makes my stomach feel much better.