yeh i have some, but im the same, i would like more proof/studies, but cant find any.

ive used them 3 or 4 times. i put them on overnight and when i took them off they were brown and had dried hard, but i wasnt convinced this was toxins.

maybe it was some reaction with moisture or sweat from the skin i thought, so i poured water on one of them and let it sit for a day or so. it did turn brown also, not as dark a brown as when it was on my foot and it didnt go hard.

ive actually forgot where i put them, have been meaning to try them again.