Evidence-based·Last reviewed May 30, 2026·How we grade evidence

Pregnenolone

HormoneBest in the morning

Useful mainly for research-context adjunctive use in schizophrenia or addiction, under clinician supervision.

Quick decision guide

May help most

research-context adjunctive use in schizophrenia or addiction, under clinician supervision

Common dosing range

10–100 mg/day (often 25–50 mg)

When to expect effects

Days to weeks

Watch out for

Converts into other steroids and may shift androgen/estrogen levels; avoid with hormone-sensitive cancers

What is it

Pregnenolone is a steroid hormone synthesized from cholesterol in the adrenal glands, brain, and other tissues. It is the precursor to all other steroid hormones, including progesterone, DHEA, testosterone, estrogens, cortisol, and aldosterone. It also acts independently in the central nervous system as a neurosteroid.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You are exploring a clinician-supervised adjunct in schizophrenia or cannabis use disorder
You accept that effects in healthy adults are unproven
You can monitor for hormonal side effects

Probably skip if…

You have or are at risk for a hormone-sensitive cancer
You want a proven cognitive enhancer or anti-aging benefit
You are pregnant, breastfeeding, or on hormonal medication

Evidence at a glance

schizophrenia adjunct

Limited Evidence
Effect
Small and inconsistent
Best fit
people with schizophrenia adding it to antipsychotics under supervision
Time
Weeks

memory and cognition

Mixed Evidence
Effect
Not demonstrated
Best fit
not established
Time
Not established

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

schizophrenia adjunct

Disease adjunct
Limited Evidence

Small randomized trials of adjunctive pregnenolone in schizophrenia have shown inconsistent improvements, mainly in negative symptoms and cognition, with several null results. The signal is weak and preliminary, supporting only cautious, supervised investigational use.

Effect size
Small and inconsistent
Time to effect
Weeks
Best fit
people with schizophrenia adding it to antipsychotics under supervision
Less likely
those expecting a standalone treatment

Bottom line: A preliminary adjunct for schizophrenia symptoms with inconsistent results.

Evidence is mixed

Trials are split between modest benefit on negative or cognitive symptoms and no effect.

SourceMarx et al., 2014 — PubMed· conflictingKardashev et al., 2018 — PubMed· conflicting
SourceMarx et al., 2014 — PubMedKardashev et al., 2018 — PubMed

memory and cognition

Mechanism only
Mixed Evidence

Pregnenolone and its sulfate modulate NMDA, GABA, and sigma-1 receptors and enhance memory in animal models, fueling interest as a nootropic. Human trials in healthy adults have not shown reliable cognitive benefit, and extensive first-pass conversion to other steroids limits how much reaches the brain.

Effect size
Not demonstrated
Time to effect
Not established
Best fit
not established

Bottom line: Cognitive benefit in healthy adults is unproven despite plausible neurosteroid mechanisms.

SourceOsuji et al., 2010 — PubMed

How it works

Pregnenolone is the master steroid hormone, sitting at the top of the steroidogenesis pathway. In the body, it can be converted to progesterone (and from there to many other steroids) or to DHEA (and from there to androgens and estrogens). In the brain, pregnenolone and its sulfated form (pregnenolone sulfate) modulate NMDA, GABA, and sigma-1 receptors, with effects on memory, mood, and neuroprotection. Oral pregnenolone is rapidly absorbed but also undergoes extensive first-pass metabolism, with much of it converted to other steroids before reaching the brain. Blood levels rise within hours and return toward baseline within a day. Despite popular interest, the effects of supplementation in healthy adults are not well established.

How to take it

1. Typical dose
10–100 mg/day, commonly 25–50 mg
2. Timing
Morning, to align with the diurnal steroid rhythm; avoid evening if it disturbs sleep
3. With food
Either
4. How long to try
Days to weeks to assess; long-term safety data are limited

What to track

target symptoms (mood, psychotic symptoms, craving)
sleep and irritability
acne or other hormonal effects

3 commercial forms

Compare the main delivery options and what they’re best suited for.

Pregnenolone (oral)

The standard supplement form, usually as tablets, capsules, or sublingual lozenges.

Extensive first-pass metabolism

Pregnenolone (micronized)

Marketed for better bioavailability.

Improved absorption with smaller particle size

Sublingual or transdermal forms

May provide more direct delivery; less common than oral.

Bypass first-pass metabolism

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

headacheirritabilityinsomniaacnemood swings

Serious risks

  • hormonal shifts in androgen and estrogen levels from downstream conversion

Who should avoid it

  • people with or at risk for hormone-sensitive cancers
  • those with endocrine or seizure disorders
  • people on hormonal medications

Pregnancy & breastfeeding

Avoid in pregnancy and breastfeeding.

Interactions

hormonal medications (oral contraceptives, HRT) and corticosteroidsModerate

pregnenolone is converted into multiple steroid hormones

sedatives and anesthetics affecting neurosteroid pathwaysModerate

neurosteroid activity may add to CNS effects

anticoagulantsMinor

possible interaction

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

clearly stated pregnenolone dose per serving
micronized form for absorption
third-party purity testing

Be skeptical of…

anti-aging master hormone
reverses memory loss
fixes adrenal fatigue

Frequently asked questions

Is pregnenolone a hormone?⌄

Yes. It is a steroid hormone and the precursor to all other steroid hormones (progesterone, DHEA, cortisol, testosterone, estrogens).

Should I take pregnenolone for memory?⌄

Despite marketing claims, controlled clinical evidence for cognitive enhancement in healthy adults is essentially absent.

Will pregnenolone increase my testosterone or estrogen?⌄

It can, because the body converts pregnenolone into many other steroid hormones. Effects vary by individual and dose. Monitor hormone levels if used long-term.

Is pregnenolone safe with hormonal birth control?⌄

Theoretical interactions exist; consult a clinician before combining.

Can pregnenolone treat 'adrenal fatigue'?⌄

'Adrenal fatigue' is not a recognized medical diagnosis, and pregnenolone has not been shown to address the symptoms typically attributed to it.

References by claim

schizophrenia adjunct

Marx et al., 2014 — PubMed (2014) link

Kardashev et al., 2018 — PubMed (2018) link

memory and cognition

Osuji et al., 2010 — PubMed (2010) link

Track Pregnenolone with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store
Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.