Nature's Sunshine Spirulina is a higher source of digestible protein (60-71%) than meat, and a unique vegetarian source of Vitamin B 12, and the entire complex of B vitamins.
Spirulina is an excellent source of glyconutrients (16-20%) including the eight essential monosacccharides, as well as other mono- di-and polysaccharides, glycoproteins, glycolipids, and two other recently discovered immune stimulants unique to spirulina: immulina, and calcium spirulan.

It's exciting to realize that spirulina is so primitive in the history of life on earth, that we find that "newly discovered" nutrients have been available in spirulina all along, and those of us taking spirulina haven't missed anything.