I've found this wonderful place with information on spirulina research:-
The Spirulina Health Library contains over 100 published scientific references covering 30 years of international research. It is solely for education. It is not intended as medical advice or as a guide for self-treatment. Consult a qualified health care practitioner for diagnosis or treatment of any disease or medical condition.
I recommend to take a look at Spirulina Health Library
Here is a brief sample:-
"Spirulina is gaining more attention from medical scientists as a nutraceutical and source of potential pharmaceuticals. There are several new peer reviewed scientific studies about Spirulina's ability to inhibit viral replication, strengthen both the cellular and humoral arms of the immune system and cause regression and inhibition of cancers. While these studies are preliminary and more research is needed, the results so far are exciting..."