Green spirulina has higher nutritional properties and health benefits than blue spirulina. Blue spirulina only contains an antioxidant - the blue pigment called phycocyanin extracted from the green spirulina. On the other hand, green spirulina contains more than antioxidants. It also contains B vitamins, iron, copper, and essential fatty acids called gamma linoleic. However, not everyone enjoys the flavor of green spirulina, and that's why most health stores sell blue spirulina as it's tasteless and adds a lovely natural blue color to food.