TSPO, or the Peripheral Benzodiazepine Receptor is involved with synthesis of cortisol, but also with testosterone & the immune system. When I read that Ginkgo blocked this, I was concerned.
Then I read Ginkgo had no appreciable effect on testosterone or the immune system (if anything, it enhanced them) which really confused me.
Then I read this study, which documented that although it blocked TSPO in the Adrenals (ie. the one responsible for generating Cortisol), it didn't have any effect on TSPO in the rest of the body.
The scientists reckon this is the reason why the herb is used to 'help people cope with daily-stress'.
I swear, the more I research these herbs, the more fascinating they get.