Originally posted by Dante B.
7Keto DHEA can help.
However, as has been said, it's not wise to lower cortisol unless you have a specific concern that you wish to address (e.g. stress, certain drugs that can elevate cortisol, and so on).
As as was mentioned, this applies to estrogen as well. There isn't an "evil" hormone. Every year a new hormone is demonized, instead of presented in the context of what's necessary for balance.