Kinoki foot pads supposedly detoxify your body if you wear them on your feet while you sleep. Although the pads turn a dark brown or black, that is no proof that they are actually detoxifying your body. This product is clearly a scam. The pads contain vinegar and are likely turning that color due to a chemical reaction with sweat.
The product's website is full of testimonials from people claiming that the pads can detoxify your internal organs, cleansing your body of microscopic parasites, radiation, heavy metals, metabolic waste, chemicals, mucous, toxins and cellulite. However, there is absolutely no research to support these wild claims.
While the benefits touted by using Kinoki foot pads sound great, this product likely has no health benefits, other than a possible placebo effect if you actually believe that it is working. You are better off watching what you eat, drinking spring water, avoiding recreational drugs, refraining from alcohol abuse, not smoking, exercising regularly and not exercising heavily outdoors when the air is polluted.
If you try to live a clean lifestyle, this will go a long way to avoiding the buildup of toxins in your body. Don't waste your money on Kinoki foot pads. The only thing that it will cleanse is your wallet of cash.