So why are they wrong?
The idea that chlorophyll is the ‘green blood of plants’ is very popular among its fans. There have even been claims that the molecular makeup is so similar that chlorophyll can be turned into, or indeed used in transfusions instead of, blood.
But when ingested, liquid chlorophyll — despite what its staunchest promoters claim — cannot actually help do the job of hemoglobin. Chlorophyll ISN’T hemoglobin. In fact, their individual functions are quite different.