Pseudo B-12 Vials (IMAGE) University of Washington Caption Researchers first purified "pseudo"-B12 from spirulina, a marine-derived health supplement, so they could measure it in the ocean. These bottles contain fractions of spirulina during a purification step. Credit Katherine Heal/University of Washington Usage Restrictions With credit License Licensed 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.