If you want to create soaps, cosmetics and skin care products that leave your skin feeling silky, without irritation, cornstarch is a great ingredient to add to your list of supplies. Cornstarch is usually used as a thickener when preparing food, but it can also be used in baby powders, bath bombs, body powders, milk baths, and natural cleaners. It has been known to improve the absorption capability of the skin and may be used to dry out breakouts without causing excessive dryness or skin irritation.