This is fake. It's useless if it's used by friends. Just black hair and oil. Later, I learned that it was a chemical reaction. At that time, my friend was brainwashed and didn't listen to anything. It's only now that they react. They call the manufacturer. This is the cheapest inferior foot patch, a few cents. If you change it to a set meal, it will cost several hundred dollars. Is an out-and-out liar.