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Pregnenolone
A steroid-hormone precursor and neurosteroid being studied mainly in clinical psychiatry; human evidence is early and there is no proven benefit for cognition, mood, or anti-aging in healthy people.
What the evidence says
Pregnenolone appears to help in 3 of 4 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 1992–2026 with a typical study size of 60 participants.
Based on 37 studies · 3 meta-analyses · 20 RCTs · 4,642 total participants
Confidence
High confidenceWhat the studies found
By outcome
Scores Emerging (4.5) because evidence is confined to small psychiatric RCTs with mixed results; no benefit is proven for cognition, mood, or hormones in healthy people.
16 randomised trials
every one checked individually
Every randomised or controlled trial of Pregnenolone indexed in PubMed, not a hand-picked subset. Meta-analyses and systematic reviews are deliberately excluded from this count: most of them cover many compounds at once, so counting them would inflate it.
PubMed · as of Jul 2026
9 trials ongoing or recruiting · 31 completed on ClinicalTrials.gov
16 of the completed trials have posted results
Registered trials show research momentum for Pregnenolone, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Pregnenolone is often called the 'mother of all hormones' because it's the upstream precursor from which other steroid hormones are made, including DHEA, progesterone, cortisol, estrogen, and testosterone. It's synthesized from cholesterol and declines with age.
As a neurosteroid it modulates GABA-A and NMDA receptors, and its metabolite allopregnanolone is involved in emotion regulation.
The human evidence base is small and largely confined to clinical populations: several small RCTs report modest improvements in negative and cognitive symptoms of schizophrenia, mixed signals in bipolar depression, and reduced craving in substance-use disorders, alongside an fMRI study and older animal work.
These trials use far higher doses (often 100–500 mg/day) than typical supplements and do not establish efficacy for cognitive enhancement, mood, energy, or hormone 'optimization' in healthy adults.
Because oral pregnenolone feeds into multiple downstream hormones, effects are unpredictable and benefits in the general population remain unproven.
Converts to multiple hormones
Direct brain effects
Negative modulator of GABA-A
How Pregnenolone works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Natural levels decline with age; test levels before supplementing
May interact with hormone therapy
May reduce sedative effects via GABA modulation
Both are steroid hormone precursors — combining may cause excessive hormone stimulation
Tip: Reduce dose
Tip: Reduce dose; may indicate progesterone conversion
Tip: Take in morning only
Pregnenolone has an evidence score of 4.5/10 — emerging evidence based on 37 indexed studies, including 3 meta-analyses. A steroid-hormone precursor and neurosteroid being studied mainly in clinical psychiatry; human evidence is early and there is no proven benefit for cognition, mood, or anti-aging in healthy people. Representative study: PMID 30864461.
The commonly studied dose of Pregnenolone is 5-50mg daily. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Pregnenolone is in the morning. Take it with food. Pregnenolone is the master steroid hormone precursor, synthesized from cholesterol in the mitochondria.
Pregnenolone has a safety rating of "moderate". That is a category, not a measure of individual risk, and there are precautions worth knowing. Reported side effects are uncommon and include acne, irritability, insomnia. Use caution if any of these apply to you: Hormone-sensitive cancers; Seizure disorders (may lower threshold).
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Reviewed by Dr. Baher Al Hakim · Last reviewed May 2026 · evidence from 37 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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