Spirulina is rich in a range of vitamins and minerals essential for maintaining a healthy immune system, like vitamins E, C, and B6. Research finds that spirulina also boosts the production of white blood cells and antibodies that fight viruses and bacteria in your body.Consuming spirulina is one way to supplement protein and vitamins in the diet.Spirulina is a fantastic source of antioxidants, which can protect against oxidative damage.Its main active component is called phycocyanin. This antioxidant substance also gives spirulina its unique blue-green color.