I thought there was a synthetic heme.Is it only available in other countries? Is it common for porphyria to cause chronic iron deficient anemia. I do not know if there is a connection between porphyria and anemia. Where I live central oregon no one really knows much about co-pro porphyria. I have a second enzyme shortage of varigate also. When I have attacks I go to the hospitol and they give me glucose infusions. It truly helps. Not one of my doctors knows much about the porphyrias. Is there a hospitol or dr. that does on the west coast? Thank you so much for your time and knowledge. Sherry