Lethal Dose Comparison (image) National Institute of Standards and Technology (NIST) Share Print E-Mail Caption A lethal dose of heroin compared to a lethal dose of fentanyl. This is just an illustration -- the substance actually shown in this photo is an artificial sweetener. Credit © Bruce A. Taylor/NH State Police Forensic Lab Usage Restrictions This is not a NIST photo, please be sure to credit the photographer. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.