Spirulina is a type of blue-green algae that grows in both fresh and saltwater. It is known for its high nutritional value, containing a rich source of proteins, vitamins, and minerals. Many people consume spirulina as a dietary supplement, often in powder or tablet form, to boost their overall health and energy levels. This algae is particularly popular among health enthusiasts due to its antioxidant properties and potential benefits for the immune system. Additionally, spirulina is considered a sustainable food source, as it requires less land and water to produce compared to traditional crops, making it an environmentally friendly option.