MolMeDB () is a comprehensive, freely available database of membrane interaction data, including permeation for small molecules. This database stores the manually obtained data from scientific papers as well as the permeability data obtained from ChEMBL by data mining workflow. Currently, there are more than 900,000 interactions for almost 500,000 molecules in MolMeDB. Most of the data is permeability data from 56 theoretical or experimental methods on 48 various membranes.