Usually we recommend somewhere around 4-6 chlorophyll a day for a typical low hemoglobin. Some like to get on it toward the end of their pregnancy as a hemmorhage prevention, but we don't regularly recommend it for that purpose alone. I have also heard of chlorophyll being used with very successful results for premenopausal women who are bleeding too heavily with their periods. It seems to get better results and has the added benefit of being somewhat laxative instead of somewhat constipating. Chlorophyll is available as a liquid, in gel caps, or dried tablets.
Liquid is probably best but some find the flavor and sight objectionable.
Capsules seem to do just as good a job prenatally, but we carry the liquid in our birth bags for quick fluid replacement and clotting after a heavy bleed.