Spirulina is a seaweed species belonging to the blue-green algae (Arthrospira platensis).

It has been used as a food for 400 years, and is currently well known as a dietary supplement. Spirulina blue color is obtained through a simple physical process of concentrating the blue-green algae. Spirulina is grown in water reservoirs. 

Historically the majority of the production took place in Asia, but now production also takes place in Europe & the US, as regulatory approvals have come through as Coloring Foodstuff (EUR 2013) and as a Color Additive (USA 2013 & 2014).

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