Yes, it is fine to use the typical inexpensive ALA in healthfood stores. Not enough is known about the way the other ones works (R-lipoic acid). As far as I know, it's not recommended. But go on the frequent dose website - http://health.groups.yahoo.com/group/frequent-dose-chelation/

There you'll find exacty what ALA people are using and what experiences they are having with it. They're all using Andy Cutler's protocol and will be able to provide you with all the information you'll want to know about this.