2. When you buy it, you can see if its trademark and hygiene license are available, and whether it is produced by a regular manufacturer. Or see if it's genuine. It should be edible, but it is unsanitary when it is produced, and it is not produced by a regular manufacturer.

Be careful what you eat, and it is best to buy it in a regular supermarket or official flagship store, so that you can at least eat healthily and feel more at ease.