I have been taking Alpha Lipoic Acid 600mg daily. This was prescribed by my neuro at Cleveland. I think several here have posted that the R lipoic acid is a better choice than the alpha lipoic acid. I have not been able to find the rLipoic acid locally in any of the drugstores or health food stores so I went on-line and found many choices. A lot of the information I have found reveals that there are many other ingredients in the capsules. Does anyone have a particular brand that they recommend? Thanks for your input.