http://www.jissn.com/content/5/1/11
For those who don't want to read the whole thing:
Conclusion
PS supplementation with 600 mg per day for 10 days blunts the cortisol response to exercise-induced stress. In addition, PS significantly increases the testosterone to cortisol ratio. These findings suggest that PS is an effective supplement for combating exercise-induced stress. PS supplementation promotes a desirable hormonal balance for athletes and might attenuate the physiological deterioration that accompanies overtraining and/or overstretching.
