Some Klamath algae products tested were above the limit of 1 μg/g of microcystins. Is this alarm and concern about Klamath AFA, as well as other microalgae such as Spirulina or Chlorella, warranted? And more widely, is the danger of microcystins as high as it has been purported to be?
Identification of anatoxins in blue-green algae food supplements using liquid chromatography-tandem mass spectrometry https://www.tandfonline.com/doi/abs/10.1080/02652030118558 R. Draisci,E. Ferretti,L. Palleschi & C. Marchiafava Pages 525-531 | Published online: 03 Dec 2010 Identification of anatoxins in blue-green algae food supplements using liquid chromatography-tandem mass spectrometry
https://www.tandfonline.com/doi/abs/10.1080/02652030701822045 Food Additives and Contaminants Vol. 25, No. 7, July 2008, 885–894 Y. Jiang, P. Xie*, J. Chen and G. Liang
More recently, a study where the authors tested the three microalgae Spirulina, Chlorella and Klamath, found that among the 3 main edible microalgae the most microcystins-contaminated was Chlorella, followed by Spirulina, with Klamath AFA being actually the least contaminated. When considering all the possible contaminants, and not just microcystins,
the researchers (, p. 10) concluded that “…the most contaminated products were those containing Spirulina”. P. Gallo, et al., Contaminazione da biotossine in prodotti ittici e integratori alimentari, Ingredienti Alimentari. XI, Ottobre (2012), pp. 6–11.