The R-ALA that I'm using is from GeroNova Research. The 300 mg capsules are currently unavailable on Amazon but they do have the R-ALA in 100 mg capsules. I take two 300 mg capsules in the morning and two at night (1200 mg). - https://www.amazon.com/Geronova-Research-R-Lipoic-Acid-Vcaps/dp/B003JOBJ5O/ref=sr_1_3.

I get the R-ALA as part of the Protocol 525 supplements - https://theprotocol525.com/