Both versions of the bill, called the SAFE Sunscreen Standards Act, were introduced by a bipartisan group of lawmakers who say that consumers need more effective sunscreens to help prevent skin cancer. Sun-safe practices, including the use of sunscreens, have been an important tool in counteracting that increase. Both types of filters protect the skin by absorbing UV rays and converting the energy to heat, while mineral sunscreens also scatter some UV light. The lack of progress has exasperated many doctors, who have been waiting for improved sunscreens to recommend to their patients. “I don’t think it’s going to be how we’re going to win the war on skin cancer,” said Xu.