Elixir International of New Mexico Inc.
Nutritional Comparison Value Chart of Spirulina, and its protein content:

Rice...................7%;
Wheat................6-10%;
Eggs..................18%;
Beef...................18-20;
Peanutbutter......25%;
Dried Skim Milk.35%; Soybeans...........40%
Brewers Yeast...45%;
Chlorella.............40-50%
Spirulina.............64-73%

Spirulina maxima Nutritional Constitution (Chart from Sosa Texcoco S.A.)
Spirulina compared to many other foods provides the highest content of protein along with its' many other nutrients and therefore can be utilized as a compact food. Most proteins are not high energy foods because they are slow to digest. However, Spirulina's proteins are 90% digestible and quickly absorbed by human metabolism.