I thought I'd tell you my recent experience in case it is helpful to anyone else. I take thyroid and adrenal support (I'm under the advise of Dr P).
A few months ago I asked my GP for an aldosterone test. Unbeknown to me, at the same time, they did kidney function tests. These came back below normal. As I now get print outs of all my tests there was no hiding place and my GP had to tell me. I asked him if "we" had any historic kidney results. When he called up the last 6 years on his computer I could see the tests had been below normal for 5 of the last 6 years.
I hopped online and came across alpha lipoic acid, and I now take 2 tablets a day. I have also been drinking green tea and detox teas. About 6 weeks after starting on this regime I had a repeat blood test. My kidney function had returned to better than it was 6 years ago. In the last couple of weeks I have noticed a significant improvement in my over all feeling of well being. I still take the ALA and still drink the herbal teas.
I've also noticed a significant drop in my blood pressure - it is usually high. The Vit B3 in the NAX I take is said to help lower blood pressure. I definitely noticed a drop when I started using hydrocortisone cream and there has definitely been another reduction since improving my kidney function.
Just a thought for others to look out for in case it applies to you too.