Welcome @behappy, You can buy the alpha lipoic acid at most health stores that sell supplements. You can also get them online through Amazon or other stores. The R-ALA is the better version. I’ve purchased these before - https://a.co/d/bSXHtFT

Fullscript on the internet sells it in various quantities. If your medical provider is in their list of "authorized providers" you get 25% off list price.