Heres a couple things found just by googling cortisol control and stuff
From
http://www.physicalmag.com/index.php?a=66&p=9
Glutamine is an amino acid that can reduce the loss of muscle proteins by blocking the receptor sites for cortisol, blunting its effect on the muscle cells. Five grams of glutamine twice per day should help keep your cortisol levels in check.
From
http://findarticles.com/p/articles/mi_m0KFY/is_11_22/ai_n8591758
9 | Get your glutamine You knew it had to show up here, right? Recent studies have pooh-poohed glutamine's beneficial effects on cortisol levels, but I disagree. There are many other studies that take a pro-glutamine view in muscle building. Glutamine works to spare BCAAs, and keeping BCAAs high helps keep cortisol levels from rising. In addition, glutamine pushes water into muscles, and hydrated muscles remain anabolic. Several studies show that supplemental glutamine can help keep cortisol levels in check.
Glutamine can help suppress the amount of cortisol circulating in blood. Glutamine also increases GH levels, combating cortisol's catabolic effects. For a beneficial effect on cortisol levels, athletes may need a lot more glutamine than amounts that are often suggested. I recommend taking 5 to 10g before and another 5 to 10g after training to help reduce cortisol levels.
These are obviously arguable points so do your own research yada yada yada. Glutamine seems to fall into the "everyone responds differently and many studies show different views," category but other than like 3 supps out of hundreds, what isn't like that?
Anyway, I did find other stuff back when I was looking into it but I personally find it helpful for recovery and like I said in my last post, I like to take things that help my overall body/immune health and this is definitely one of them.