What tests are performed on each product, and do these tests ensure that the products do not cause adverse reactions?

Each product undergoes the following tests: dermal test, eye irritation test, formula stability test, thermal stability test and product-package compatibility test. While it is true that the product is approved if it passes these tests, no product can guarantee that it will not cause irritation to a person with sensitive skin. Even the most famous brands state in their labeling that in case of irritation, stop use and consult a doctor.