Thank you both! Got it now.

The reason I started taking R-Lipoic Acid back in 2014 was that a nutritional test done by an int. medicine doctor showed I was borderline low on it. The doc suggested supplementing. Regardless, I'll give it a shot.

I'm also digging into the genetics of the involved SCL5A6 gene. I'm having a tough time finding information, but it looks like I do have a couple of homozygous variants.