This resource is now available to the research community, and we encourage its use in marine biogeochemical studies including DOM characterization, natural products research, and metabolomics. During this first effort, we have made 700 mg marine DOM reference material available, with future, larger scale extractions planned. 50 mg of the current batch is available free of charge for researchers with financial barriers to purchase. A fixed extraction point associated with an established university research laboratory (Tjärnö Marine Laboratory, University of Gothenburg) was selected to ensure ongoing access, consistency of source, and a long-term supply. Thus, we intend to make TRM widely available and encourage its day-to-day analytical use. Enquiries can be sent to the corresponding author (JAH).