Spirulina is a type of dark green algae that is super concentrated with all sorts of nutrients. Astronauts have a unique problem. They have to prevent certain health issues, such as: 1. Bone density depletion 2. Muscular atrophy 3. Metabolic rate change 4. Loss of body mass 5. Cardiovascular breakdown 6. Decreased immune system Astronauts … Continue reading WHY ASTRONAUTS USE SPIRULINA ?