Antiperspirants and deodorants cause breast cancer. Internet postings and other sources have suggested that people who use deodorants or antiperspirants could be at higher risk for breast cancer. These stories have claimed that the products contain harmful substances that can be absorbed through the skin via nicks and cuts from shaving. However, the National Cancer Institute (NCI) and the FDA have not found any link between the use of underarm antiperspirants or deodorants and the subsequent development of breast cancer.