Artist rendering of small molecules (IMAGE) Aalto University Caption Metabolites are extremely small – the diameter of a human hair is 100,000 nanometers, while that of a glucose molecule is approximately one nanometer. Credit Matti Ahlgren/Aalto University Usage Restrictions May be used in publications related to this release with appropriate credit. License Original content 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.