Pregnenolone
Preg · P5 · Pregnenolone sulfate
The mother of all steroid hormones. Your body makes every other hormone from this one precursor.
What is Pregnenolone?
Pregnenolone is the master precursor steroid — your body synthesises it from cholesterol, and then converts it downstream into virtually every other steroid hormone: cortisol, DHEA, progesterone, testosterone, oestrogen, aldosterone. It sits at the very top of the steroidogenesis cascade. When pregnenolone levels decline (which they do significantly with age), all downstream hormone production can suffer.
But pregnenolone is not just a precursor. It is a potent neurosteroid in its own right. Pregnenolone sulfate modulates GABA, NMDA, and sigma-1 receptors in the brain, influencing memory formation, mood regulation, and neuroplasticity. Some researchers consider it the most potent memory-enhancing steroid ever tested in animals.
The biohacking community uses pregnenolone for cognitive enhancement, mood support, and as a gentler alternative to direct hormone replacement. The logic: rather than supplementing testosterone or cortisol directly, supply the upstream precursor and let your body decide what it needs. In practice, it does not always work this cleanly — individual conversion rates vary dramatically — but the approach has appeal.
How Does It Work?
As a precursor: Pregnenolone is converted by various enzymes into all downstream steroid hormones. CYP17A1 converts it toward DHEA/androgens, 3-beta-HSD converts it toward progesterone/cortisol, and sulfotransferases convert it to pregnenolone sulfate (the neuroactive form).
As a neurosteroid: Pregnenolone sulfate is a negative allosteric modulator of GABA-A receptors (mildly alerting/anxiolytic without sedation), a positive modulator of NMDA receptors (memory enhancement), and an agonist at sigma-1 receptors (neuroprotection and mood regulation). This unique receptor profile explains why users report improved mental clarity and mood without stimulation.
What Does The Research Say?
Moderate evidence. Some human data, mostly animal studies.
Animal studies show dramatic memory enhancement — pregnenolone sulfate is one of the most potent memory-improving compounds ever tested in rodent models. Human studies are more limited but show: improved cognitive function in patients with schizophrenia (multiple trials), mood improvement in clinical populations, and reduction in fatigue.
As a hormone precursor: evidence that supplementation raises downstream hormones is mixed. Some people see significant increases in progesterone or DHEA; others see minimal change. The conversion depends heavily on individual enzyme activity. This makes it less predictable than direct hormone supplementation but potentially safer.
Reported Dosages
These are dosages reported in research literature and community reports. They are NOT medical recommendations. Always consult a healthcare professional.
Cognitive enhancement: 10-50mg daily, taken in the morning.
Hormone precursor support: 50-100mg daily (higher doses shift more toward downstream conversion).
Start low (5-10mg) as some people are sensitive.
Sublingual may improve bioavailability and neurosteroid effects.
Available as OTC supplement in US; prescription in some other countries.
Side Effects & Risks
Generally mild: overstimulation or irritability at higher doses, occasional headache, acne (if converting significantly to androgens), hair thinning in susceptible individuals. In women, high doses could theoretically increase androgens. Insomnia if taken too late in the day (due to NMDA modulation).
Legal Status by Country
Prescription only. Not available as OTC supplement.
Legal supplement. Available over the counter. DSHEA-regulated.
Prescription in most EU countries.
Prescription only. TGA Schedule 4.
Where to Buy Pregnenolone
Buy Pregnenoloneon Amazon UK →Affiliate link — we may earn a small commission at no extra cost to you.
Important Disclaimer
This profile is for educational and research purposes only. It does not constitute medical advice. Pregnenolone may be regulated or illegal in your jurisdiction. Do not use any compound without consulting a qualified healthcare professional. StackPedia does not sell, supply, or promote the use of any controlled substance.