@madje Good information. Five years after my PN was diagnose my symptoms are mostly numbness and some tightness in my feet, ankles and lower legs (depending on the weather, lol!) Sensory motor skills affected, but not dramatically. I have been taking a few of the recommended supplements for about 2-3 years including R-Alpha Lipoic Acid. But, not nearly at the dosage you are! I feel I've held the progression at bay, but would love to see some actual improvement.
I'm nervous about upping the dosage from 300mg to 600 or as you have, even 1200. Are there no side effects???