The full Dr. Barbara Sturm collection is hypoallergenic, or formulated to ensure minimum instance of allergic reactions. However, if you have noticed sensitivity reactions in the past following the use of cosmetic products, you can carry out a test. Simply apply a coin-sized amount of the product (taking it from a tester) to the inside of your forearm and leave it on, ideally for a whole day. If the area becomes red or has any type of reaction, then the product probably contains a raw material that is not tolerated. If there is no reaction, then you can use the product confidently.