This "blue-green algae" (actually a bacterium) grows in subtropical and tropical waters with high salinity, in Central America, Southeast Asia, Africa and Australia.People have used it as food for centuries.According to the WHO, its use as a source of protein or vitamin A in India, for example, is undisputed.We have no shortage of these substances.Now read on with STERN PLUSWhat you really need to know: background, analysis & classification© G+J Medien GmbH