After hearing about the side effects of Rhodiola Rosea and Ginkgo (they lower 'endopeptidase' activity -> leading to higher Arginine Vasopressin -> which is implicated in depression & anxiety) I began a quest to find natural inhibitors of this enzyme. My findings are this:
1) California Poppy has 2 compounds which appear to inhibit the V1 receptor (which may be the receptor responsible for increasing cortisol / stress). Interestingly, California Poppy has traditionally been used to treat anxiety. Maybe this is partially the reason why.
http://www.ncbi.nlm..../pubmed/1535715
http://www.ncbi.nlm..../pubmed/7684742
2) HOWEVER, the most promising evidence appears to be for a herb called ''Alisma plantago-aquatica''.
There was one study which found a chinese herb formula called Danggui-Shaoyao-San to be effective at reducing AVP thus improving depressive-like problems.
After researching this formula, I found that Alisma was included in the ingredients -> and a separate study found that Alisma itself is effective in reducing AVP. Therefore, it makes sense to conclude that ''Alisma plantago-aquatica'' is the herb responsible for lowering AVP. You can find it on MaxNature.com .
http://www.ncbi.nlm....pubmed/21664113
http://www.ncbi.nlm....pubmed/11914959
If these work, then this may be the final barrier to chemically lowering cortisol.
Edited by agwoodliffe, 01 November 2013 - 06:11 PM.