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What is spirulina, really? That green powder you might add to a smoothie comes from microscopic organisms that use sunlight for energy, then are dried and sold as a supplement. But "blue-green algae" is only a nickname: spirulina isn't a true alga. It's cyanobacteria-sun-powered bacteria. In short, spirulina is a blue-green, photosynthetic bacterium, usually dried and sold as a food supplement.