Spirolina Food supplement

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My friend offer me a food supplement (he was into Networking for these kinds of products) and it was called spirolina. He said that it was the most nutritous food supplement ever (which I kinda expect from someone selling his/her product). However, when I check some information about this food supplement, I found in Wikipedia that this may cause a certain cancer if not taken properly. Of course, wikipedia is not always reliable source of information but at least people who edited it has some cross reference. Have you tried this food supplement? What can you say about its effects?