Pond scum? Okay. Let's unpack that. Harvested by the Aztecs from the shores of Lake Texcoco (now Mexico City's bone-dry sub-basement) this mighty Meso-American moss has recently been reclassified as a Cyanobacteria, neither animal nor plant. Fear not! It is nevertheles packed with nutrients and healing agents, and has been a staple in traditional medicine circles for centuries. Beta-carotene, riboflavin, thiamine, Vitamins C, B6, E and K, and a bunch of minerals like iron, magnesium, sodium and potassium make Spirulina a tiny corkscrewy cornucopia.