A friend said that Chang 'ai goat milk mask has a national R&D patent. Is it true?/You don't say. Where can I check this?

You can ask your friends to show the packaging of this product. If it is a patented product, the patent number must be printed on the package. According to the patent number, all patents can be searched online. If there is no patent number on the package, as a professional in this field, I can clearly tell you that this so-called "always love goat's milk mask" is definitely not a patented product.