The U.S. Food and Drug Administration (FDA) has received communications from the Council for Responsible Nutrition as well as U.S. Sens. Dick Durbin (D-Ill.) and Richard Blumenthal (D-Conn.) urging the agency to take action on the dietary-supplement ingredient known as AMP Citrate or DMBA , and FDA has indicated that it will consider taking regulatory action on the stimulant. According to a news source, GNC stopped selling Redline White Heat and OxyTHERM Pro on its Website one day after USA TODAY criticized the products for containing the ingredient, a “close chemical cousin of DMAA —a stimulant the FDA has warned is an illegal ingredient that contains risks of heart attacks, seizures and neurological conditions,” according to the newspaper. USA TODAY and the senators cited a recent study examining AMP Citrate to support concerns about its safety. Pieter A. Cohen, et al., “A synthetic stimulant never tested in humans, 1,3-dimethylbutylamine (DMBA ), is identified in multiple dietary supplements,” Drug Testing and Analysis, October 8, 2014. See USA TODAY, October 8 and 9, 2014.