VRP in their Vitamin research news bulletin of Nov. 2002,has an article re 
R-lipoic acid.To quote"This unique supplement is the biologically  active form 
of a ' mitochondrial antioxidant' that plays a number of key roles in human 
health and aging.
If you go to their site: www.VRP.com you may be able to bring up the complete 
article on why R-lipoic is the only form to take.
Harold 
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