Spirulina is a “cellular nutrition superfood”. It is a one-celled microscopic blue-green algae and one of the best sources of easy absorbed bio-available plant based protein. Packed with vitamins, minerals, enzymes, iron, phytonutrients and trace elements, it is a great source of nutrients especially to vegetarians and vegans and people who need a bit of extra support with their health. It stimulates beneficial flora like lactobacillus and bifidobacteria in your digestive tract.
Spirulina is available in tablet, capsule or powder form. Its important to buy only Organic and GMO free.
I have listed few articles from good sources that I found helpful: