Alpha Lipoic Acid is used for treatment of Diabetic Neuropathy as mentioned in this study done at the University of Maryland. It also describes Alpha Lipoic's action in repairing cells damaged by diabetes. Dosage listed here is small. In clinical Alzheimer's studies, they use 600 units morning and evening without side effects except for the need to supplement your biotin because the ALA does deplete the biotin in your body.
After diagnosis 8 years ago, I used 600 mg of Alpha Lipoic Acid morning and evening and also take 5,000 mcg of Biotin with the morning dose for several years. I had d.n. in my left heel (felt like I was walking on a pebble…kept checking to see if I had a stone in my shoe) when I was first diagnosed. In a few months, the sense diminished, then one day I realized it was gone. I've not had any other occurrences since then. For the last 3 years I have decreased my dosage to the ALA and Biotin to the morning dose only…no evening ALA.