As a holistic health practitioner, I have found that almost none of the wonderful, beneficial healing tools have been "proven" to be of value in the scientific sense. Only prescription or patentable items are taken through the FDA "proving" process, because there is no profit in "proving" a natural remedy.
Have people healed themselves using chlorophyll? My experience is that, in the form of spirulina, broken-cell-wall chlorella, or fresh vegetable juice (such as juiced parsely), the answer is yes. I have used bottled chlorophyll, and it doesn't seem to do as much good, maybe because it is chemically altered.