Roman Catholic AnswerThe Catholic Church is the Mystical Body of Christ and is here on earth to bring people to Him, and, through the sacraments, Him to the people. As far as medical procedures are concerned, the Church does not normally rule on them except insofar as there is a problem and the procedure (or substance, in this instance) would go against the revelation of Our Blessed Lord. For instance fetal stem cell therapy involve the killing of human beings to harvest the stem cells, thus fetal stem cell therapy would be immoral. PolyHeme is based on normal red blood cells and does not involve harm or morals.