I use strange Japanese herbal  patches taped to my feet overnight : in the morning they have turned from white to black . After 2 or 3 days they are only slightly discoloured and by the 5th day they are still white in the morning . Can definitely feel it working as I need to drink even more water than usual after sleeping with the patches on my feet and I can see my face  looks much clearer  in the mirror and I am less tired .