Blubein's Spirulina Spirulina, a blue-green algae, is heralded as a superfood and a major source of food and nutrition, often considered the best food for the future. It has gained recognition as a dietary supplement for astronauts due to its nutritional density. Spirulina is derived from two species of cyanobacteria, Arthospira platensis and Arthospira maxicana. It has been awarded "the best natural food" and has been found to be completely non-toxic by the United Nations. NASA scientists have determined that 1 kg of Spirulina is nutritionally equivalent to 1,000 kg of assorted fruits and vegetables. Spirulina is rich in easily digestible protein, comprising 60 to 70% of its content, and provides all essential amino acids, a rarity among plant foods. It is also a significant source of calcium and contains 6 to 15 mg of beta-carotene per day, equivalent to 10,000 to 25,000 Units of vitamin A activity. Notably, 6 grams of Spirulina is sufficient to meet the requirement for 12 mg of beta-carotene.