1, first of all, the effect, foot patch is not a medicine, it can't cure diseases, its main function is similar to foot massage, it acts on the body by stimulating the acupoints and reflex zones of the foot, and it has no pharmacological effect, so it belongs to physiotherapy products at most, focusing on disease prevention.

2. In addition, foot stickers can't be judged only by black or not. Many counterfeiters take advantage of this. Everyone likes to make a fuss about superficial phenomena, so we must be careful to distinguish them. It is recommended to choose regular and cheap ones.

3. The foot patch refers to a unique formula, which has high cost and good effect. The key is the core formula, but most of the foot stickers on the market are open formulas. A manufacturer produces dozens of brands of foot stickers, although the price and packaging are different, but the effect is basically the same. It is recommended to choose a regular foot patch, such as Karama foot patch.