This question is hard to say. Ordinary old people will not easily change what they already believe unless they see the truth, so the best way is to let her see the truth. If she has bought it, it is unreasonable for her to use it several times in the face of specific effects. At this time, the old people will believe what they see, and if they feel that it has no effect, they will not continue to buy. If they haven't bought it yet, then control her financial resources first, hehe. This is generally not feasible. It is unfilial for a child to do so. You can find someone you can trust to persuade the elderly. Generally speaking, the elderly trust their peers. Find an old man who has bought this kind of health care product before and explain to his grandmother how he feels after using this so-called health care product. Old people generally believe it, but naturally they won't buy it. As you said, if you are cheated, take the time to see if you can recover some losses. These swindlers are really cheating. Talk to your grandmother more. In the future, you should discuss this problem with your children before making a decision. Hehe, you didn't say the details. I can only guess so far. I wish you an early persuasion of your grandmother!