Nodularin is provided as a dried film in an amber vial, at the specified mass purchased and shown on the vial. It may not be visible in the vial, and should be dissolved in methanol or ethanol at a concentration no less than 75% organic solvent, with repeated rinsing of the sides of the vial with a pipet tip to fully dissolve the product. Once dissolved in the original organic solvent, the product is stable for ≥1 year when stored at -20oC and tightly sealed. For biological applications, dissolved toxin should be diluted in an appropriate buffer for the application, reducing the organic solvent content to a level that it will not impact the application. For HPLC or other chemical applications, it should be diluted in an appropriate solvent or mobile phase.