what about the microscopic greens like spirulina of all the controversial findings I’ve shared from the medical literature over the years this is the one I get the most mail about people love their pons gum so I’ve stayed on top of the literature and it’s time for an update there’s no doubt that spirulina does some amazing things but as with everything in life it’s all about risk benefit and so although in 2007 the data pointed against spirulina and I threw mine out encouraged others to do the same is it possible that the balance of evidence has shifted back in favor still harmful half and a half or crept back too helpful in 2007 I was concerned about spirulina because of muscle breakdown and these new findings have me concerned about liver cancer too 94% of samples were found to be contaminated with hepatic toxic microsystem toxins .