There is growing evidence that Alpha Lipoic Acid (ALA) has beneficial effects on the treatment of Type 2 Diabetes and some of its complications. Its wide-ranging benefits for diabetes include improved glycemic control, improved insulin sensitivity, reduction of oxidative stress, and reduction of neuropathy.
A recent review of ALA for diabetes concluded that the supplement’s side effects were generally limited, and found that it was generally safe for use even by those with impaired kidney or liver function. (NYBC adds only a caution about a potential thyroid issue, especially for those taking higher doses of ALA.)
See the NYBC entry
Poh Z, Goh KP. A current update on the use of alpha lipoic Acid in the management of type 2 diabetes mellitus. Endocr Metab Immune Disord Drug Targets. 2009 Dec;9(4):392-398.