DC Nail Spa is a nail salon located in Washington, D.C. with 263 reviews on Yelp. There are no specific reviews or information available on the ingredients or materials used in their services. However, it is important to note that nail products can contain ingredients that should be used and handled properly to minimize potential for overexposure. It is recommended to ask the salon about the products they use and to be aware of any potential health effects that could be associated with overexposure. Reviews on Yelp are mixed, with some customers praising the salons ambiance and attention to detail, while others have had negative experiences with the service.