Even though there are many different formulas available, you may have a hard time finding the best one for your skin.  If you take the time to learn about each of the Neutrogena Acne Products, you should be able to determine which ones will work for you.  On the other hand, you may still find that you develop an allergy to some of the ingredients found in these products.  That said, you can just as easily find yourself in the same situation by using products from other manufacturers.  At the very least, if you are skeptical about using Neutrogena products, you may want to see if you can get a free sample.