I haven't heard of it, but you can go to the Chinese medicine shop to buy some rhubarb yourself, but it may cause diarrhea, because the main ingredient of laxatives is rhubarb.

This kind of thing is best not to be used. It's a three-point poison It's the same if you don't eat it. If you are too lazy to exercise, eat less. The effect is obvious if you insist on a few points.

I wish you success in losing weight!