Pregnenolone

Pregnenolone is a hormone and hormone-precursor. It and its derivatives formed in the brain have modulatory effects on nervous system function. It is a precursor to DHEA.

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https://www.lifeextension.com/Magazine/2019/1/Restore-Youthful-Cognitive-Function/page-01

https://www.consumerlab.com/answers/will-pregnenolone-help-slow-down-aging/pregnenolone_aging/