Quick answer: Pregnenolone is made from cholesterol in the adrenal glands, ovaries, testes and brain, and it is the starting point for cortisol, DHEA, progesterone, testosterone and estrogen. Levels can decline with age. Low levels may show up with fatigue or stress-related hormone changes. Pregnenolone supplements can change other hormones, so use them only with guidance.
Key takeaways
Pregnenolone is made from cholesterol and sits at the very top of the steroid pathway, feeding into cortisol, DHEA and the sex hormones.
Levels can drift down with age, stress, low cholesterol intake or thyroid changes, and a low result is often read alongside DHEA-S and cortisol.
Because pregnenolone can shift several other hormones at once, supplements are best considered only after testing and with a clinician’s guidance.
Pregnenolone sits upstream of several hormones, so a single lab value is easiest to understand alongside your other results and history.
What is Pregnenolone?
Pregnenolone is the first hormone made from cholesterol in the steroid pathway. Every other steroid hormone is built from it. This marker is part of the Healthspan Assessment panel available to my 1-on-1 patients.
Why Pregnenolone matters
Pregnenolone is a precursor for cortisol, DHEA and sex hormones. It also matters for brain function and memory, and for mood and the stress response.
Understanding your result
Reference ranges vary by lab, age and sex. Your provider interprets your result against the lab’s range and your overall picture, rather than chasing a single number. Functional labs are optional. They can be helpful in more complex cases, and in my practice they are available only to patients working 1-on-1 with me.
What low Pregnenolone can mean
Low pregnenolone can reflect aging, chronic stress, very low-fat or low-cholesterol intake, or thyroid issues.
What high Pregnenolone can mean
High pregnenolone can come from supplements or from some adrenal conditions.
What affects Pregnenolone
Pregnenolone is affected by age, stress, cholesterol and nutrition, and thyroid function.
Ways to support healthy levels
Eat adequate healthy fats and protein, manage stress and sleep (see DHEA-S), and check thyroid function. Only use pregnenolone supplements with testing and provider guidance.
Pregnenolone and healthy aging
Pregnenolone is made inside mitochondria, so it reflects mitochondrial and hormonal health. Like DHEA-S, it can decline with age. See cortisol.
When to see a naturopathic doctor
It may be time to see a naturopathic doctor if you have fatigue and low stress tolerance, or hormone symptoms with an unclear cause. The same is true if you notice memory or mood changes, or if you are considering pregnenolone supplements.
Have questions about whether this fits your situation? Dr. Kneessi offers a free 15-minute call to talk through your history and goals.
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Pregnenolone at a glance
| Topic | What the article explains |
|---|---|
| Where it comes from | Made from cholesterol inside mitochondria in the adrenal glands, ovaries, testes and brain |
| What it feeds into | Cortisol, DHEA and the sex hormones |
| What can affect it | Age, stress, cholesterol and nutrition, and thyroid function |
| Supportive habits | Adequate healthy fats and protein, stress care, sleep, and checking thyroid function |
Practitioner-grade options in my Fullscript catalog: if you and your clinician decide a supplement makes sense, my supplement guide by health goal links to the practitioner-grade products I trust.
Questions to ask about a pregnenolone test
Which other hormones should be measured alongside pregnenolone, such as DHEA-S and cortisol, so the result has context? Was the sample taken at a consistent time of day, and could recent stress, sleep loss, or medications affect the number? If a pregnenolone supplement is being considered, how will its effect on downstream hormones be rechecked?
Because pregnenolone sits upstream of several hormones, it is usually most useful as part of a broader panel. The functional labs page explains the comprehensive blood work panels I use. If you and your clinician decide a supplement is reasonable, quality matters, and how I choose practitioner-grade supplements explains what I look for in testing and labeling. You can also browse my supplement guide by health goal or take the free supplement quiz.
Frequently asked questions
What is pregnenolone?
The precursor hormone made from cholesterol that feeds all steroid hormones.
Does pregnenolone decline with age?
It can. In one study of healthy adults, pregnenolone sulfate peaked around age 32 in women and declined after that, while levels in men stayed fairly stable from their late twenties on.
Should I take pregnenolone?
Only with testing and guidance; it can raise other hormones.
Is pregnenolone tested routinely?
No. It is a specialty test used in specific situations.
What are the symptoms of high pregnenolone?
High pregnenolone is uncommon outside of supplement use, and research has linked elevated levels most often to taking pregnenolone or to rare adrenal enzyme differences. Because pregnenolone feeds into other hormones, some people who supplement report symptoms that reflect those downstream hormones, such as acne, irritability, headaches, sleep changes, or menstrual changes. A high result is worth reviewing with your provider alongside DHEA-S, cortisol, and sex hormones.
What are the symptoms of low pregnenolone?
Low pregnenolone does not have a unique set of symptoms. Because it sits at the top of the steroid hormone pathway, low levels have been linked in research to patterns such as fatigue, low stress tolerance, changes in memory or mood, and lower levels of downstream hormones like DHEA-S and progesterone. Those same symptoms have many other possible causes, which is why the number is best read in context.
What are optimal pregnenolone levels for women?
There is no single agreed optimal number. Reference ranges differ between labs and shift with age, and levels in women also vary across the menstrual cycle and through perimenopause. In practice the more useful question is whether your result fits your age, your symptoms, and the rest of your hormone panel, which is something to review with a provider who knows your history.
How can I increase pregnenolone naturally?
Your body makes pregnenolone from cholesterol, mainly in the adrenal glands, ovaries, and testes, so foods do not supply it directly. Research on raising it without supplements is limited. The habits most often discussed are the ones that support the whole hormone system: steady sleep, handling long-term stress, regular movement, and eating enough overall. If a result comes back low, it is worth looking at why before reaching for a supplement.
Can pregnenolone affect sleep?
It can. Pregnenolone and its sulfate form act on brain receptors involved in sleep and alertness, and small studies have reported changes in sleep stages with supplementation. Some people say they feel calmer or sleepier, while others notice trouble sleeping, especially at higher doses. Because responses vary, any sleep change is worth mentioning to the provider guiding the supplement.
Pregnenolone sits upstream of several hormones, so a single lab value is easiest to understand alongside your other results and history.
Work with a naturopathic doctor near you
Dr. Kneessi sees patients in person in Odenton and by telehealth anywhere in Maryland. Learn more about visits for Annapolis, Odenton, Crofton, and Severna Park, or read about hormone testing and functional medicine in the area.
You can book a free 15-minute consult, or start with the free 28-Day Reset for Energy and Focus, a short daily email series on sleep, light, movement, and food.
Sources
- Miller WL, Auchus RJ. The molecular biology, biochemistry, and physiology of human steroidogenesis and its disorders. Endocr Rev 2011. PMID: 21051590. https://pmc.ncbi.nlm.nih.gov/articles/PMC3365799/
- Vallée M, Mayo W, Le Moal M. Role of pregnenolone, dehydroepiandrosterone and their sulfate esters on learning and memory in cognitive aging. Brain Res Brain Res Rev 2001. PMID: 11744095. https://pubmed.ncbi.nlm.nih.gov/11744095/
- Havlíková H, et al. Sex- and age-related changes in epitestosterone in relation to pregnenolone sulfate and testosterone in normal subjects. J Clin Endocrinol Metab 2002. PMID: 11994368. https://pubmed.ncbi.nlm.nih.gov/11994368/
- MedlinePlus: DHEA Sulfate Test
- MedlinePlus: Adrenal Gland Disorders
This article is for educational purposes only and is not medical advice. It does not replace an individual evaluation. Talk with your healthcare provider before starting supplements or changing medications, especially if you are pregnant, nursing, or managing a health condition.
