Any healthfood shop or pharmacy should stock alpha lipoic acid. It's an antioxidant and pretty easy to get hold of. You can also order it online if you want. Here are some places that have it and probably at a dose that is preferable (lower).

Kirkman's Alpha Lipoic Acid - (US Oregon).
Link to order ALA online (25 mg caps). http://www.kirkmanlabs.com/products/antioxidant/alpha_lipoic/AlphaHO_C_25mg_90_Spec281.html

Worldwide Health Centre - (U.K. Depot St Albans, Hertfordshire) and (US Depot Carson City, NV 89706).
sells alpha lipoic acid - 50 mg, 100 mg and 500 mg caps . Scroll down to near halfway to check them out. Click on product for indepth description.
http://www.worldwidehealthcenter.net/category.php?cat=AN

VRP products - (Carson City, NV 89706 USA)
Scroll down the list to see - ALA 100 mg or 500 mg. http://www.vrp.com/express.asp?c=11...ncludes/vrp.css&p=no&s=0