Nickel is a heavy metal and is therefore found everywhere. Consequently, traces of it can be found in any product - cosmetic, food, etc. For this reason, we consider a nickel test to be superfluous, as it is not indicative of a complete absence of nickel in the product. For people who are allergic to nickel, we advise doing a test on a tiny area of skin at your neighbourhood pharmacy to see how the product may affect you. In reality, the allergic reaction is dependent on a number of variables, including the “amount” of traces present in the cosmetic, the subject's sensitivity to the substance, the type of cosmetic product (rinse-off or intended to remain on the skin), the consumer's use of the product itself, and consequently, the level of exposure to the nickel it may contain.