If you can check, you can check QS certification in official website, Food and Drug Administration. If you don't know how to inquire, you can call the manufacturer for consultation.

Upon inquiry, there is a production license.

Shengse company is not a company. Don't listen to the nonsense of these anonymous netizens. After a product becomes famous, there will be many things with peers.

In addition, some people say it is useful, others say it is useless, and I believe it is true. As soon as anything comes out, some people say it's good and some people say it's bad. Let's say it's an Apple phone. Many people say it's bad.

If it works, you have to buy it yourself and try it for a while to see if it works.