Spirulina is a microscopic filamentous aquatic cyanobacterium that is sometimes cultivated for use as food especially as a dietary supplement. spirulina benefits also include weight loss, increased energy, and stimulation of the immune system. 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. Phycocyanin can fight free radicals and inhibit production of inflammatory signaling molecules, providing impressive antioxidant and anti-inflammatory effects.