I think this is a scam. The Japanese detox foot pads are made in China. When you wear them overnight as instructed, they turn black as if they have absorbed toxins from your body, but you get the same result if you simply get them wet, so the results you see after using them may simply be your skin breathing or feet sweating. These pads claim to draw out toxins, but I know from experience, that feet can draw in camphor rubs and essential oils. After using these pads for two consecutive nights (during an ice storm when I had no outside exposure), I developed a phlegmy (Covid-like) chest cough that lasted for a week. Use at your own risk.