I would like to see those studies. Many times, I have seen posts that claimed studies that were not actually valid studies. In many cases, the person doing the so called study can place their fingers on the scales either inadvertently or prejudicially.
In my observations of blood under the microscope ( in vitro ) where the blood was zapped continuously for an extended period of time, the RBCs did show s slight distortion but recovered quickly after the current was removed. After the removal of the signal, there was less clumping / aggregation of the blood cells than before zapping. From what I have seen and read, this is a benefit rather than a detriment.
There is nothing to indicate that such distortion would occur in vivo because of more than one factor. First, the amount of time that the signal applied to the blood is far less. Second, the blood is under the influence of the current for a much shorter time, and third, During the time that the blood is out of the field of influence, it has time to recover.