alimentary seal

I have an important question:

i readed here a lot about  bad teas, bad sellers, bad qualitys, bad producers and even about taes that don”t pass the conditions to be drinked and my doubt is:

What is the alimentary seal of aproval in  China?

What simbol in the package of a tea shows me that this tea complies whit alimentary codes?

Also i have buyed teas all around the world from ebay and aliexpress and some of them come in the package whit an alimentay code that is  an “s” in light blue….is that code syaing that that tea complies whit regulations?

I ask this because i buyed a lot of teas in my lie ( some even landed in a zipper box only hahaha) and some of them i wanted to share them in a course i will show to people, others i will sell. But i am honest , i don”t like to sell cheap things or bad things without knowing.

Sorry if my questions are not enought clear, i will clarify them  all the nmecesary times so they can be more understandable.