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 distinguish them carefully.
3. Finally, it is suggested to choose regular, cheap and not greedy.