Arthrospira Platensis - Bulk Herb available in 1lb. increments only. Spirulina is the common name for two species of cyanobacteria, or blue-green algæ. Many consider this plant nature's most powerful "green" food — it's one of the highest and most digestible sources of protein known. Strong, grassy with a pungent sea flavor Spirulina Powder can be used in smoothies, seasoning mixes, in green sauces, hummus, meatballs or even brownies.