Spirulina - from its Latin name spirulina Arthrospira platensis - is a blue-green cyanobacterium that appeared 3.5 billion years ago. It's so-named because, under the magnifying glass of a microscope, you can see its green spiral shape. Already consumed by the Aztecs in the form of dried patties, it is found in lakes in warm regions such as Lake Chad. Rich in vitamins (A, B12, E) and minerals (iron, calcium, magnesium), it has an impressive protein content: 15g of spirulina contain as much protein as 100g of beef. For all these reasons, the Food and Agriculture Organization of the United Nations (FAO) recognizes spirulina as a potential weapon in the fight against hunger and undernutrition.