Health concerns[edit]
A 2002 study showed that Chlorella cell walls contain lipopolysaccharides, endotoxins found in Gram-negative bacteria that affect the immune system and may cause inflammation.[12][13][14] However, more recent studies have found that the lipopolysaccharides in organisms other than Gram-negative-bacteria, for example in cyanobacteria, are considerably different from the lipopolysaccharides in Gram-negative bacteria.[15] A 2010 study found that Chlorella contains a peptide, known as Chlorella-11, that actually inhibits the inflammation caused by lipopolysaccharides from gram-negative-bacteria.[16]