Competitors use cheap sources that may contain 10% something good.  What is of concern is the 90% "I don't know."  GNLD does not use such sources.   Common to the market are algaes like duniella salina, blue green algae, and chlorella.  Also used are African potatoes that Africans don't eat, pine tree bark, grape seeds, a fungus (blakeslea trispora), and a weed called Japenese Knotweed.  Which of these looks appetizing?