Animal studies indicate that pregnenolone is found in the brain in ten-fold larger concentrations than the other stress-related hormones (including DHEA). Pregnenolone is the precursor from which almost all of the other steroid hormones are made; including DHEA, progesterone, testosterone, the estrogens, and cortisol. Despite its powerful metabolites, pregnenolone is acknowledged to be without significant side effects Pregnenolone has been found to:

• Enhance memory
• Make people smarter and happier
• Increase feelings of well-being
• Reduce stress-induced fatigue

It may also:

• Improve immunity
• Reduced symptoms of PMS and menopause
• Repair the covering (myelin) of nerves

Pregnenolone levels decline with age. Pregnenolone seems to have a balancing effect. It is a precursor to many other hormones and may be able to bring the levels of other hormones up or down as needed.