PLTGold® is completely xeno-free. No heparin is required (or used in manufacture) and you will get no clotting.
PLTMax® is not. We add a small amount of heparin. Keep in mind this is pharmaceutical grade heparin. It is a widely prescribed and safe drug for direct injection in humans. So far, we have not had any commentary from any regulatory agency suggesting that the addition of heparin is of any significant concern.