Blood transfusion has a number of significant risks, just not in comparison to the cases where it is employed. From the FDA, "The more common risks are allergi

Blood transfusion has a number of significant risks, just not in comparison to the cases where it is employed. From the FDA, "The more common risks are allergic reactions and transfusion associated circulatory overload and less common risks include transfusion related acute lung injury or transfusion associated circulatory overload and infectious disease transmission." A Sense of impending doom is a side effect of an incompatible blood transfusion and is typically followed by death. These companies are also mostly fly by night "move fast and break things" motto companies that do not undergo rigorous medical evaluations. A large part of the FDAs concern in their official statement is that these companies are not conducting clinical trials.