Spirulina is one of the most well known freshwater algae and has been known as a food source for centuries. The Mayans and Aztecs already supplemented their diet with microalgae, and Spirulina is highly valued in China and Japan. Japanese people are indeed particularly well known to live very long thanks to their healthy diet. Spirulina algae for human consumption are grown under controlled conditions in large open water systems or in sealed glass tube systems. Even the Mayans and Aztecs supplemented their diet with microalgae.
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