There is a MIT paper about an experiment where they concluded that an increased cortisol level reduced false memories when general disturbances of the memory retrieving process were absent.
When it comes to regulating cortisol, there is this stuff, courtesy of Bing AI:
“Cortisol is regulated by:
The hypothalamus, which releases corticotropin-releasing hormone (CRH) when cortisol levels are low.
The pituitary gland, which secretes adrenocorticotropic hormone (ACTH) in response to CRH, signaling the adrenal glands to produce more cortisol.”
Source: Susanne Diekelmann, Ines Wilhelm, Ullrich Wagner, Jan Born. Journal of Cognitive Neuroscience (2011) 23 (4): 772–781.
Ransacked Crash Site 