Q: How do manufacturers test cosmetic products for irritant and allergic contact dermatitis?
Most products consumers buy will have been tested by the manufacturer for possible allergy and irritancy. The Human Repeat Insult Patch Test (HRIPT) is the industry standard for new product testing.
If testing is done, then how do problematic products enter the marketplace? The answer lies in understanding how HRIPT is conducted. A breathable patch with the product under review is placed on a study participant’s upper back and changed every Monday, Wednesday, and Friday for 3 weeks. The participant is then given a rest period and