The addition of adulterants is called adulteration. The most common reason for adulteration is the use by manufacturers of undeclared materials that are cheaper than the correct and declared ones. The adulterants may be harmful, or reduce the potency of the product, or they may be harmless. Adulteration implies that the adulterant was introduced deliberately in the initial manufacturing process, or sometimes that it was present in the raw materials and should have been removed, but was not. Goat milk has many advantages, such as nutrient-rich and not easy to lead to allergies, thus getting the consumers' recognition. However, in the field of milk production, mixed with cow milk is not uncommon.