Consumers are becoming more and more concerned about the safety of the cosmetic products they are using. Fears of allergies and dermatitis caused by tainted or poisoned cosmetics have been ever-present in recent years. Certain ingredients used in cosmetics, such as fragrances and preservatives, can trigger an allergic reaction. Obviously, these ingredients play a pivotal role in the cosmetic products of our choice and correct dosing of these substances therefore is of key importance to avoid irritation of the skin through over-exposure. Examples of over-exposure to preservatives have frequently been observed in several historic cases, one example being beauty creams that contained mercury. Beauty creams occasionally were reported to contain excess amounts of mercury, with poisoned consumers exhibiting clear toxic neurological symptoms.