Spirulina (Arthrospira platensis) is a blue-green algae (cyanobacterium), that’s very high in protein, vitamins, and amino acids. It grows in high pH (10-11) brackish water that is inhospitable to most other things, so it’s fairly impervious to being “polluted” by other strains. Basically a complete “superfood” that if you had to, you could exist on with only water. As a food additive, it balances your diet as it provides a complete nutritional, easy to process and absorb, supplement to what you already eat. It’s fairly easy to grow at home, with a 20 gallon aquarium, air pump, and some easy to make nutrients. Once you get a culture, you can spawn new tanks from that culture, so it’s self propagating. Below is a video of the process, a comprehensive tutorial document, and a source for basic starter supplies:
Free eBook: “Grow your own spirulina“.
More free ebooks at http://www.green-trust.org/freebooks/