Even natural products can contain stuff that irritates skin. Bismuth is an ingredient in natural mineral powder foundations, used to help create an even, lasting and luminous coverage. But Clint Dowdell of Nude By Nature says that since it has sharp edges, it can scratch the skin when you buff it in, resulting in itchiness and irritation. However, Nude By Nature’s Natural Mineral Cover $41.99 (1) is free of bismuth. Instead, it contains kaolin clay that melts onto skin and sets like a liquid. Also, try Inika’s Mineral Foundation $69 (2).