Hi Thank you for the reply, I will read what is on the bottle: Jarrow formulas R-ALpha Lipoic Acid plus Biotin 100 Mg Stabilized 60 veggie caps Superior bioavailability and activity, not sure on right sided or left sided isomer. I take one 100 mg cap each morning. A lot say to take acetyl-l- carnitine and benfotiamine along with it but I am not sure what that combo would do to benefit the r lipoic acids effectiveness.