It depends on what has caused the renal failure. There are lots of natural ways to support the kidneys but to eliminate what caused the problem in the first place is also fairly neccessary.
My son had dialysis and then a transplant and we were told that they had tested everything and it was a mystery as to the cause as young white boys who don't have diabetes should not go into renal failure. Now I realise that they should have tested for HMT as I now know he has lead and mercury poisoning confirmed by a recent test. I was exposed during the time I conceived and was pregnant with him. Only problem now that he has had a transplant is that we have all the anti rejection drugs and steroids poisoning him as well!