I was reading a post where someone was having to take a break from nutritional IV's because of their veins. I have heard several people saying they were having difficulty getting their IV's into their veins after repeated IV use.They said when they first started it was easy but then got harder and harder to find a vein to use. Is this actually a case of scarred or collapsed veins? When this happens can veins actually recover after a break or are they permanently damaged? If so will the blood flow have to find alternate routes? Thanks.