FWIW, I got free samples of some of the stick-on patches a year or two ago, and didn't notice any effect. I left them on three or four days I think, as long as they'd stay.

Not that there were any instructions anywhere, on the packaging or the website, on how they were supposed to be placed. Which tends to suggest that "it doesn't matter because they don't do anything."

But the jewelry is pretty... unlike the patches.