Moisturizers are products that are intended to hydrate the skin. Another related topic of interest includes Parabens. They also increase the water content of the skin, giving it a smooth appearance. They also provide a barrier against the loss of water from the skin. Moisturizers contain special ingredients that help to replace the oils contained in the skin or to protect against the loss of moisture from the skin. The safety of Moisturizers is established by selection of ingredients that are safe and suitable for this purpose. In addition, Moisturizers are assessed for their potential to cause skin irritation or cause allergic reactions. Product safety is also established though strict adherence to the principles of Quality Assurance and Good Manufacturing Practices. This includes testing the compatibility of the product with packaging as well as shelf-life stability. Finally, the safety of products is monitored in the market-place to track any reports of consumer injury. Companies include a phone number on their products where comments or complaints may be reported.