Spirulina is a type of blue-green algae that grows in both fresh and saltwater. It is known for its high nutritional value, containing proteins, vitamins, and minerals. Many people consume spirulina as a dietary supplement due to its potential health benefits, including boosting energy and supporting the immune system. This algae is often available in powder or tablet form and can be added to smoothies, juices, or other foods. Spirulina is also popular among vegetarians and vegans as a source of protein and essential nutrients that may be lacking in their diets.