Spirulina is among the world’s most popular supplements. It is loaded with various nutrients and antioxidants that benefits your body and brain. Spirulina is an organism that grows in both fresh and salt water. It is a type of cyanobacteria, which is a family of single-celled microbes that are often referred to as blue-green algae. Just like plants, cyanobacteria can produce energy from sunlight via photosynthesis. Spirulina was consumed by the ancient Aztecs but became popular again when NASA proposed that it could be grown in space for use by astronauts. A standard daily dose of spirulina is 1–3 grams, but doses of up to 10 grams per day have been used effectively.