Spirulina is a great product that improves overall health, therefore many people use spirulina as a supplement. Spirulina can help prevent some serious health problems, such as allergies, diabetes, and obesity. Many doctors recommend this product. There is no side effect and Spirulina contains many essential nutrients for human body, such as B complex vitamins, vitamin E, and also beta-carotene. This product also contains high amount of protein. Therefore, it is considered as one of the best protein sources. It also contains some other nutrients, such as minerals, cholorphyll, and also antioxidants. These active ingredients are good to improve the overall human health.