Daily's Spirulina (Tablets): Spirulina has a long history of safe use in humans. It was a valuable food source of protein and vitamin A for the ancient Aztecs in South America. Spirulina grows naturally in fresh water lakes of South America and is highly digestible without special processing. Spirulina also provides a wide range of bioactive compounds and is widely recognized as one of the most concentrated “Super Foods”. Two tablets provides Organic Spirulina 500 mg.