1. Barrows JN, Lipman AL, Bailey CJ (2003) Color Additives: FDA's Regulatory Process and Historical Perspectives. Food Safety Magazine. Available from: https://www.foodsafetymagazine.com/magazine-archive1/octobernovember-2003/color-additives-fdas-regulatory-process-and-historical-perspectives/. Accessed 5 Aug 2020
2. Methylene Blue: PubChem Chemistry Database. U.S. National Library of Medicine, National Center for Biotechnology Information. Available from: https://pubchem.ncbi.nlm.nih.gov/compound/methylene_blue#section=Top. Accessed 5 Aug 2020
3. Oz M, Lorke DE, Hasan M, Petroianu GA (2011) Cellular and molecular actions of Methylene Blue in the nervous system. Med Res Rev 31(1):93–117
4. Drug Approval Package: ProvayBlue (Methylene blue injection); Summary Review (2016) U.S. Food and Drug administration, Center Drug Evaluation and Research. Available from: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2016/204630Orig1_toc.cfm. Accessed 5 Aug 2020
5. Methylthionine: Farmacotherapeutisch Kompas Zorginstituut Nederland; [Available from: https://www.farmacotherapeutischkompas.nl/bladeren/preparaatteksten/m/methylthionine