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Spirulina is a type of bacteria called cyanobacterium, which is often referred to as blue-green algae. While health claims for spirulina supplements include purported benefits to our blood pressure, cholesterol, and seasonal allergies, health concerns include potential risk of muscle breakdown, liver cancer, and liver toxicity. Indeed, 94 percent of samples were reported to be contaminated with hepatotoxic microcystin toxins, and a potent neurotoxin appears to have been found in spirulina supplements, as well.

The United States Pharmacopeia (USP) safety evaluation of spirulina, however, finds that “the available evidence does not indicate a serious risk to health or other public health concern when spirulina is properly identified, formulated, and used.” Yet therein lies the challenge: Spirulina is often grown and collected in open lakes, so we have no idea what other algae may crop up.

Researchers have reported a range of adverse reactions of people taking spirulina products, ­­but they attribute these issues to non-spirulina algae toxin contaminants within spirulina supplements. So unless there is third-party testing of each batch, which no company could presumably afford to do, I encourage people to avoid spirulina products.

The information on this page has been compiled from Dr. Greger’s research. Sources for each video listed can be found by going to the video’s page and clicking on the Sources Cited tab. References may also be found at the back of his books.


Image Credit: WILL POWER / Flickr. This image has been modified.

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