As a blue-green algae, spirulina has powerful immune-boosting abilities. Besides general immunity, it also supports the growth of healthy gut bacteria, which helps keep candida-overgrowth in check. It has also been shown to inactivate the human immunodeficiency virus associated with HIV and AIDS. Rich in essential nutrients like amino-acids, enzymes, vitamins, minerals, chlorophyll and antioxidants, spirulina is good for blood-building, especially if you have anemia. The essential fatty acid that it contains can give you healthy bones and teeth. Like chlorella, spirulina can be used to lower blood pressure and cholesterol, reduce cancer risk, and even improve memory.