化妆品中成分众多，各自的作用是什么？某一成分安全等级是多少？网上有专门网站给出结果。

1.   https://www.cir-safety.org/

About CIR

The Cosmetic Ingredient Review (CIR) studies individual chemical compounds as they are used in cosmetic products.  CIR relies heavily on the International Nomenclature of Cosmetic Ingredients (INCI) when identifying the ingredients to be assessed.

40 Years of CIR

For 40 years the Cosmetic Ingredient Review has worked with FDA, the cosmetics industry, and consumers to help keep cosmetics safe.

2.  http://www.cosmedna.com/

查找化妆品中各种成分的功效

3.  https://www.kqmmm.com/cosmetic/201437.html

这个也不错。