Aphanizomenon flos-aquae is a freshwater species of cyanobacteria. Cyanobacteria (blue-green algae) are an ancient clade of bacterial microphytes, part of the cyanobacteria phylum.
Aphanizomenon flos-aquae as a species has both toxic and nontoxic forms. Most sources worldwide are toxic, containing both hepatic and neuroendotoxins.
Read more about Aphanizomenon Flos-aquae: Source, Research, Toxic Forms, As A Food Supplement