Cosmetic companies need to understand if products do what they are supposed to do and whether the products have any lasting adverse effects on animals. Cosmetic companies need to know if they can claim that lipstick really does last all day or that lotion will make your skin soft. Makeup is tested on animals to help determine how long it lasts, whether it rubs off and what colors the makeup produces. Skin care products are tested on animal's skin to see if researchers can clean, moisturize or shave skin the way that the manufacturer claims. Researchers are looking to see, first of all, if the makeup or other products will live up to the labels put on the products. Second, researchers want to discover if the products the manufacturer is selling will cause skin irritation, staining or poisoning when used on animals. The information is collected and used to make assumptions about how the products will work on humans and how the products might affect humans