In my opinion, there are no formal studies to document that concentration makes a difference with PRP injections as long as you are above three to four times blood. Furthermore, studies are lacking that the addition of a matrix prolongs or enhances the results. In fact it is a foreign...
Hey there,
PRP is deposited sub dermally and sometimes in the subcutaneous plane with microneedle techniques there is minimal to almost negligible chances of injury to the hair follicle as the average length of the hair is about 5 mm.
Hope this helps.