I was doing my own r-ala research and came across the same study that's posted as a sticky. However, one of the negative effects is missing from the sticky:
Negative Results and Limitations
"For 6 wk, lean Zucker rats either remained sedentary, received R-ALA (30 mg. kg body wt(-1). day(-1)), performed exercise training (ET - treadmill running), or underwent both R-ALA treatment and ET. ET alone or in combination with R-ALA significantly increased (P < 0.05) peak oxygen consumption (28-31%) and maximum run time (52-63%). During an oral glucose tolerance test, ET alone or in combination with R-ALA resulted in a significant lowering of the glucose response (17-36%) at 15 min relative to R-ALA alone and of the insulin response (19-36%) at 15 min compared with sedentary controls. Insulin-mediated glucose transport activity was increased by ET alone in isolated epitrochlearis (30%) and soleus (50%) muscles, and this was associated with increased GLUT-4 protein levels. Insulin action was not improved by R-ALA alone, and ET-associated improvements in these variables were not further enhanced with combined ET and R-ALA. Although ET and R-ALA caused reductions in soleus protein carbonyls (an index of oxidative stress), these alterations were not significantly correlated with insulin-mediated soleus glucose transport. These results indicate that the beneficial interactive effects of ET and R-ALA on skeletal muscle insulin action observed previously in insulin-resistant obese Zucker rats are not apparent in insulin-sensitive lean Zucker rats."R
"we only observed a beneficial effect of [RLA] only in old and not in young animals."R
"The decline observed in the plasma concentration was steep (t1/2, 0.5 h)"R. ie RLA or RSLA have short plasma half-lives.
RLA did not improve "longer-term memory ... in the habituation in the open field test at a dose of 100 mg/kg body weight for 15 days ... for young mice"R.
The last sentence of the first negative effect is the key one that made me rethink adding this supplement to my list:
These results indicate that the beneficial interactive effects of ET and R-ALA on skeletal muscle insulin action observed previously in insulin-resistant obese Zucker rats are not apparent in insulin-sensitive lean Zucker rats."R
Here's the link to the full article:
http://morelife.org/supplements/RLA.html