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Pregnenolone

Evidence Level
Limited
2 Clinical Trials
5 Documented Benefits
2/5 Evidence Score

Pregnenolone is a steroid hormone precursor — synthesized from cholesterol in adrenals, gonads, and brain. It is sometimes called a 'mother hormone' because the body can turn it into progesterone, cortisol, aldosterone, DHEA, testosterone and estrogens, which means taking it can raise any of those. The only human trials of pregnenolone were done in people with diagnosed bipolar depression or schizophrenia who were already taking prescription psychiatric medication, so there is no good evidence about what it does for a healthy person. Talk to a doctor before using it, avoid it in pregnancy and breastfeeding, and avoid it with hormone-sensitive conditions. Critical: hormone precursor, not 'just a supplement' — has hormonal effects requiring caution.

Studied Dose Labels typically list 10 to 50 mg/day; no established dose for general use. Published trials used up to 500 mg/day, 10 to 100 times that, in diagnosed illness under specialist supervision.
Active Compound Pregnenolone (3β-hydroxypregn-5-en-20-one)

Benefits

Cognitive Function (Mixed Evidence)

The often repeated claim that pregnenolone improved work performance in factory workers comes from uncited 1940s research that is not referenced here and does not meet modern standards. The modern human research is not in healthy people: it was done in people with schizophrenia who were already taking prescription antipsychotic medication, at doses far above what supplement labels suggest, and in one of those trials pregnenolone was given together with L-theanine, so that result cannot be credited to pregnenolone alone. There is no good evidence that pregnenolone improves memory or thinking in healthy adults.

Supported by Trial 2, Trial 1

Bipolar Disorder Adjunct (Research)

A randomized, placebo-controlled trial gave up to 500 mg a day of pregnenolone to 80 people with bipolar depression for 12 weeks, on top of their usual prescription treatment, and depression scores improved more than with placebo. That dose is many times a typical supplement dose, and everyone in the trial had a diagnosed illness and was under psychiatric care. This says nothing about mood in a healthy person, and pregnenolone is not a treatment for depression. Nobody should add it to psychiatric medication without talking to their doctor.

Supported by Trial 1, Trial 2

Schizophrenia Cognitive Symptoms (Research)

Two randomized trials are cited, both in people already taking prescription antipsychotic medication. One added pregnenolone to risperidone in 40 women with schizophrenia and found lower total and negative symptom scores than placebo. The other, an 8 week trial, gave pregnenolone together with L-theanine, so its result cannot be credited to pregnenolone by itself. Results across the wider literature are mixed. This is supervised medical research in a serious diagnosed illness and is not a reason for a healthy person to take pregnenolone.

Supported by Trial 2

Joint Comfort (Historical, Uncited Reports)

Uncited reports from the 1940s and 1950s described less joint pain with pregnenolone, but that work is not referenced here and does not meet modern standards. The line of research was largely abandoned once cortisone type anti-inflammatory drugs arrived, and there is essentially no modern research. Pregnenolone is not a treatment for arthritis or any other disease.

Supported by Trial 1, Trial 2

Theoretical Anti-Aging / Hormone Precursor Support

Used in some integrative anti-aging protocols based on age-related decline in pregnenolone and downstream hormones. Insufficient evidence for anti-aging claims; reasonable mechanism but clinical translation unclear.

Supported by Trial 1, Trial 2

Mechanism of action

1

Steroidogenic Pathway Precursor

Pregnenolone is the first steroid hormone synthesized from cholesterol — by CYP11A1 (cholesterol side-chain cleavage enzyme). All other steroid hormones (progesterone, cortisol, aldosterone, DHEA, testosterone, estrogens) derive from pregnenolone. Taking pregnenolone adds more of this starting material, but how much of it a given person converts into which hormone is not predictable, and raising a hormone is not automatically a benefit.

2

Direct Neurosteroid Activity

Pregnenolone (and pregnenolone sulfate) acts directly on GABA-A and NMDA receptors — neurosteroid effects independent of conversion to other hormones. May contribute to cognitive and mood effects.

3

Pregnenolone Sulfate (PS) Effects

Pregnenolone is sulfated in body to PS — a negative allosteric modulator of GABA-A and positive modulator of NMDA receptors. This receptor activity comes from laboratory and animal work rather than human trials, so it describes a possible mechanism, not a proven effect in people.

4

Variable Downstream Hormone Production

Supplemental pregnenolone is converted to varying amounts of progesterone, cortisol, DHEA, testosterone, estrogens depending on individual enzymatic activity. Effects differ between individuals — explains variable clinical responses.

Clinical trials

1
Pregnenolone for Bipolar Depression

Randomized, double-blind, placebo-controlled trial of pregnenolone at up to 500 mg per day versus placebo in 80 people with bipolar depression over 12 weeks, added on top of their existing prescription treatment.

80 adults with diagnosed bipolar depression, under psychiatric care and on existing prescription treatment.

Depression scores improved more than with placebo. This was research in a diagnosed psychiatric illness, at a dose far above what supplement labels suggest, with pregnenolone added on top of standard treatment rather than replacing it. It does not show what pregnenolone does for everyday low mood in a healthy person.

2
Pregnenolone Added to Antipsychotic Medication in Schizophrenia

Two randomized, double-blind, placebo-controlled trials, both adding pregnenolone to prescription antipsychotic medication rather than testing it on its own. One added pregnenolone to risperidone in 40 women with schizophrenia. The other ran 8 weeks and gave pregnenolone combined with L-theanine.

40 women with schizophrenia taking risperidone in one trial, and people with schizophrenia on antipsychotic therapy in the other.

In the risperidone trial, total and negative symptom scores fell more than with placebo. In the 8 week trial, negative symptoms and anxiety improved, but pregnenolone was given with L-theanine, so that result cannot be credited to pregnenolone alone. Results across the wider literature are mixed. Both trials describe supervised medical treatment of a serious illness, not consumer supplement use.

Side effects and drug interactions

Common Potential side effects

Variable — depends on individual conversion to downstream hormones.
Hormonal effects — acne, oily skin, hair changes, mood changes, menstrual irregularities, breast tenderness, libido changes (variable direction).
Insomnia or sedation (variable).
Headache.
Dizziness.
Cardiovascular: theoretical from increased steroid hormones.
GI distress.
Fluid retention.
Long-term effects of supplementation poorly studied.

Important Drug interactions

Hormone-containing medications — oral contraceptives, HRT, testosterone, progesterone — additive hormonal effects; consult.
Corticosteroids — pregnenolone is cortisol precursor; theoretical interactions.
Antipsychotics — pregnenolone studied as adjunct in schizophrenia but consult psychiatrist.
Antidepressants — theoretical interactions via neurosteroid effects.
Anticoagulants — theoretical via hormone effects; minor.
Pregnancy — pregnenolone is precursor to progesterone (which IS pregnancy-supporting) but supplementation in pregnancy not studied; avoid without obstetric guidance.
Hormone-sensitive cancers — pregnenolone converts to estrogens, testosterone, etc.; avoid without oncologist consultation.
Anesthesia — general anesthetic interactions theoretical; discontinue 2 weeks pre-surgery.

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Frequently asked questions about Pregnenolone

What is pregnenolone used for?

Pregnenolone is a hormone the body makes from cholesterol and uses as a precursor to other hormones (including DHEA, progesterone, and cortisol). It is marketed for memory, mood, stress, and hormonal support, especially in aging.

What is pregnenolone good for?

It is marketed for memory, mood and stress resilience because the body uses it to make other hormones, but the human evidence does not back that up. Every human trial cited here was done in people with diagnosed bipolar depression or schizophrenia who were already on prescription psychiatric medication, at doses far above supplement labels. There is no good evidence that it improves memory, mood or stress in healthy people.

How much pregnenolone should I take?

Labels usually suggest 10 to 50 mg a day, and there is no established dose for general use. The published trials used up to 500 mg a day in people with diagnosed psychiatric illness under specialist supervision, which is not a dose to copy at home. Because it is a hormone precursor, use it only with medical guidance and, ideally, hormone testing.

Is pregnenolone safe?

As a hormone precursor it can raise progesterone, DHEA, testosterone, estrogens or cortisol, so hormone-related side effects are possible and it can also skew hormone blood test results. Do not use it without medical advice if you have a hormone-sensitive condition such as breast, uterine, ovarian or prostate cancer, and avoid it in pregnancy and breastfeeding. Because every study behind it was done alongside prescription psychiatric medication, do not add it to psychiatric medication, and do not take it for a mood or memory problem, without talking to your doctor.

What is Pregnenolone?

Pregnenolone is a steroid hormone precursor — synthesized from cholesterol in adrenals, gonads, and brain. It is sometimes called a 'mother hormone' because the body can turn it into progesterone, cortisol, aldosterone, DHEA, testosterone and estrogens, which means taking it can raise any of those.

What is the recommended dosage of Pregnenolone?

The clinically studied dose is Labels typically list 10 to 50 mg/day; no established dose for general use. Published trials used up to 500 mg/day, 10 to 100 times that, in diagnosed illness under specialist supervision. Always follow the product label and check with a healthcare provider for personal advice.

Is Pregnenolone safe, and does it have side effects?

For most healthy adults, Pregnenolone is well tolerated at studied doses. Reported effects can include: Variable — depends on individual conversion to downstream hormones. Hormonal effects — acne, oily skin, hair changes, mood changes, menstrual irregularities, breast tenderness, libido changes (variable direction). It may also interact with some medications. Pregnenolone is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Pregnenolone interact with any medications?

Possible interactions include: Hormone-containing medications — oral contraceptives, HRT, testosterone, progesterone — additive hormonal effects; consult. Corticosteroids — pregnenolone is cortisol precursor; theoretical interactions. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Pregnenolone?

NutraSmarts rates the evidence for Pregnenolone as Limited (2 out of 5). It is backed by 2 clinical trials and 3 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(3 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Brown ES, Park J, Marx CE, Hynan LS, Gardner C, Davila D, Nakamura A, Sunderajan P, Lo A, Holmes T A randomized, double-blind, placebo-controlled trial of pregnenolone for bipolar depression. Neuropsychopharmacology. 2014;39(12):2867-73. doi: 10.1038/npp.2014.138.PubMedUsed to support: Human RCT testing pregnenolone 0–500 mg/day as adjunct in bipolar depression; depression scores improved more than with placebo. This was an add-on to existing psychiatric treatment in people with a diagnosed illness, at a dose far above typical supplement amounts, so it does not describe consumer use.
  2. Kashani L, Shams N, Moazen-Zadeh E, Karkhaneh-Yousefi MA, Sadighi G, Khodaie-Ardakani MR, Rezaei F, Rahiminejad F, Akhondzadeh S Pregnenolone as an adjunct to risperidone for treatment of women with schizophrenia: A randomized double-blind placebo-controlled clinical trial. Journal of Psychiatric Research. 2017;94:70-77. doi: 10.1016/j.jpsychires.2017.06.011.PubMedUsed to support: Human RCT in 40 women with schizophrenia who were already taking risperidone; adding pregnenolone lowered total and negative symptom scores compared with placebo. It measured psychiatric symptoms in a diagnosed illness under specialist care, not memory or thinking in healthy people.
  3. Kardashev A, Ratner Y, Ritsner MS Add-On Pregnenolone with L-Theanine to Antipsychotic Therapy Relieves Negative and Anxiety Symptoms of Schizophrenia: An 8-Week, Randomized, Double-Blind, Placebo-Controlled Trial. Clinical Schizophrenia & Related Psychoses. 2018;12(1):31-41..PubMedUsed to support: 8 week RCT in which pregnenolone plus L-theanine was added to prescription antipsychotic therapy in schizophrenia; negative symptoms and anxiety improved. Because it tested a two ingredient combination on top of medication, it cannot support any claim about pregnenolone on its own, and it says nothing about cognition in healthy adults.