Neutrogena Skin iD believes in efficacy that means Neutrogena Skin iD holds itsself to the highest and strictest standards of creating an acne product that really works. A clinical trial is a research study used to determine whether new ingredients or treatments are both safe and effective. While clinical trials aren’t required for acne care products, Neutrogena Dermatologics wanted to go above and beyond the standard in order to set it apart.