I have weak knees from running when I was younger. These tights feel instantly better when you put them on. The pain goes away.
My only caution is about the sizes. I bought the first pair using the size graph. I should be a large with my height and weight. But they don’t stretch length ways very well and fell down constantly. If my knees were adjusted correctly then the couch would hand down. I went for the XL because of the longer inseam. That worked great.
So if you are not average athlete body type, you may need to try on a few sizes to fit.