3-D structure of proteins show flame retardants can mimic estrogen hormones By determining the three-dimensional structure of proteins at the atomic level, experts at the National Institutes of Health have discovered how some commonly used flame retardants, called brominated flame retardants , may mimic estrogen hormones and possibly disrupt the body's endocrine system http://www.rxpriligy.com/faq . BFRs are chemicals added or put on materials to slow or prevent the growth or begin of fire. We're starting to have a better understanding of flame retardants and their influence on human health. This particular study helps us literally discover what brominated flame retardants do if they get in the body – they interfere with the body's natural hormones, stated Linda Birnbaum, Ph.D., director of the National Institute of Environmental Wellness Sciences , part of NIH, and National Toxicology System .