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- Apr 5, 2016
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I think the 6-keto P4 is a GR antagonist, similar to plain P4. So, it may not actually lower cortisol but block its effects. As such, its effects should be milder than something like mertgoline, which by blocking serotonin affects ACTH and thus cortisol levels.
This is interesting because I have been slightly worried about the cortisol lowering aspect. I have had experience in the past where I lowered cortisol too much and it resulted in swelling and aching joints and severe foot pain. This could have also been down to lowering estrogen too much but it is hard to tell.