Argan oil improves the health of skin, hair and nails. It has a number of beneficial properties and various vitamins, and argan oil is commonly used as a moisturizer. This is why it is often found in lotions, soaps, and hair conditioners. It can be used topically or taken orally with daily nutritional supplements for a moisturizing effect. This is largely due to the abundance of vitamin E, a fat-soluble antioxidant that can help improve water retention in the skin.