Great question! Many people are curious about this. Dr. Kiriac stated that he studied the nutrient-rich chlorella for a year before deciding to exclude it. They found that it worked well in animals that make their own cellulase digestive enzymes, like cows and sheep, but not in animals that don’t make these same enzymes, like rats, pigs, and humans. The cellulase enzyme is required to break down the hard cellulose content of chlorella.

He goes on to say that breaking the cell destroys its molecular integrity and protection, exposing the loose organelles to microbial infestation and that the hard cellulose content remains a digestive burden even when cracked. When they chose two spirulina strains, their research moved quickly with all of the species tested.