Science
Tongkat Ali and Cortisol: Evidence, Limits, and Product Differences
A cautious review of Tongkat Ali, stress, and cortisol that separates frequently discussed extract trials from dried root tea and our unassayed product batch.
Does Tongkat Ali lower cortisol? A short human study of a particular extract reported cortisol-related findings, but the overall evidence is limited and preparation-specific. It does not establish that dried root tea or this specific product batch lowers cortisol.
Cortisol is often presented online as the villain behind fatigue, abdominal weight, poor sleep, and low testosterone. Tongkat Ali (Eurycoma longifolia) is then offered as an “adaptogen” that supposedly corrects the entire pattern. This narrative is memorable, but it is much more certain than the evidence.
A careful review has to separate four questions:
- What does cortisol normally do?
- What have human studies of particular Tongkat Ali preparations reported?
- Can those findings be transferred to dried root tea?
- Do they establish an effect for our current product batch?
The answer to the last two questions is no. The evidence boundary is:
Standardized extract ≠ dried root tea ≠ this product batch.
Our product has not been used in a cortisol trial, and we do not publish a batch certificate stating a eurycomanone percentage.
Cortisol is necessary, not simply “bad”
Cortisol is a glucocorticoid hormone produced by the adrenal cortex. It participates in energy regulation, blood-pressure support, immune signaling, and the response to physical or psychological demands. Its concentration normally follows a daily rhythm and changes with waking time, meals, exercise, illness, medication, and acute stress.
Both excessive and insufficient cortisol can be medically significant. However, everyday fatigue or feeling “wired but tired” does not diagnose either condition. Symptoms attributed to cortisol online overlap with sleep disorders, depression and anxiety, thyroid disease, anemia, infection, medication effects, alcohol use, under-fueling, overtraining, and many other causes.
A single consumer saliva test or symptom checklist is not a reliable basis for diagnosing an adrenal disorder. People with persistent or severe symptoms should seek clinical assessment rather than attempt to “balance” cortisol with a product.
Stress and testosterone are not a simple seesaw
The hypothalamic-pituitary-adrenal and hypothalamic-pituitary-gonadal systems can influence one another. Severe illness, prolonged energy deficit, sleep disruption, and chronic stress can be associated with changes in reproductive hormones. Yet “cortisol goes up, testosterone goes down” is not a universal one-to-one rule.
Hormones fluctuate over time. The direction and clinical importance of a change depend on context, timing, baseline health, and how measurements were taken. A cortisol-to-testosterone ratio can be useful in selected research or sports settings, but it is not a general-purpose diagnosis for anyone who feels depleted.
It is therefore too strong to say that Tongkat Ali restores testosterone by “removing the cortisol brake.” That is a proposed interpretation, not an established effect of root tea.
The frequently discussed extract trial
A short placebo-controlled study is frequently discussed in relation to Tongkat Ali, perceived stress, cortisol, and testosterone. It involved a specific commercial extract and a selected group of participants. Marketing summaries often repeat exact percentage changes from that paper.
We intentionally do not repeat the promotional percentage claims. Headline figures can obscure:
- whether a value describes change from baseline or difference versus placebo;
- the variability of the measurements;
- sample size and participant selection;
- multiple outcomes and statistical analysis;
- the specific extract used;
- the short intervention period;
- whether findings were replicated independently;
- whether a laboratory change translated into a meaningful health benefit.
The study can be described as a frequently discussed extract trial that reported hormone- and mood-related findings. It does not prove that all Tongkat Ali lowers cortisol. It certainly does not provide a measured effect size for dried root tea or our batch.
The broader 2012 Natural Standard review provides historical background on Eurycoma longifolia, but it is not a product trial and should not be treated as one: DOI 10.3109/19390211.2012.761467.
Why the preparation matters
Defined extracts
Clinical researchers need a reproducible intervention. Extract manufacturing can change the concentration and mixture of plant constituents, and standardization can set a target for a marker compound. Even then, one extract is not automatically equivalent to another.
If a trial identifies a manufacturer, extraction process, marker range, and dose, those details define what was tested. The species name alone does not.
Dried root tea
Root tea is prepared by heating dried plant material in water. The resulting drink depends on the root chemistry and preparation variables such as mass, surface area, water volume, duration, and repeated decoction. There is no validated conversion that lets us turn “milligrams of extract” into “number of slices” for a cortisol outcome.
Traditional preparation is relevant to cultural use. It is not evidence that the tea is chemically equivalent to a standardized extract.
Our product batch
Our product is dried root slices. We do not currently publish:
- a batch-specific eurycomanone percentage;
- a validated dose of extracted quassinoids per brewed cup;
- pharmacokinetic data;
- cortisol measurements from users;
- a clinical comparison with a studied extract.
For exactly what we do and do not test, read What We Test. Our Evidence Index links claims to their evidence level.
“Adaptogen” is not a clinical endpoint
Adaptogen is a broad term used for substances proposed to improve resilience to stress. It is not a substitute for naming a measurable outcome, an effective dose, a relevant population, and a quality-controlled product.
Calling Tongkat Ali an adaptogen does not establish that it:
- normalizes a person’s daily cortisol curve;
- treats an anxiety disorder;
- prevents burnout;
- improves sleep;
- corrects adrenal disease;
- improves testosterone through cortisol;
- works without adequate sleep, nutrition, or medical care.
Those claims require direct evidence. Some may be biologically plausible or worthy of study, but plausibility is not proof.
What about mood, energy, and sleep?
Questionnaires used in short supplement studies can detect changes in perceived tension, mood, or wellbeing. These outcomes matter, but they are influenced by expectations, life events, sleep, caffeine, illness, and regression to the mean. Blinding and placebo controls help, yet small trials still need replication.
There is no reliable evidence-based timeline for our root tea. Statements such as “energy in week one,” “measurable cortisol by week four,” or “full benefits by week eight” improperly convert extract study schedules into product promises.
Tongkat Ali is also not a sedative. If someone experiences insomnia, agitation, palpitations, or another adverse symptom after consuming it, the appropriate response is to stop and seek advice when needed—not to interpret the reaction as proof that it is “working.”
Sleep problems deserve attention to schedule, light exposure, sleep apnea risk, alcohol, caffeine, medications, pain, and mental health. Persistent insomnia warrants professional care.
Eurycomanone and cortisol claims
Eurycomanone is a quassinoid associated with Tongkat Ali and used as a marker in some extracts. Preclinical research can explore pathways involving stress signaling, inflammation, or hormone production. It cannot establish that a home-brewed beverage delivers a clinically active human dose.
Our batch has no published eurycomanone assay. Its bitterness cannot fill that gap. Taste may indicate the presence of bitter substances, but it cannot identify which compounds are responsible or quantify them. “Bitterer” is not the same as “more eurycomanone,” and neither is proof of a cortisol effect.
Read Eurycomanone: Marker Compound, Not a Batch Guarantee for more detail.
Better-supported approaches to stress-related symptoms
An herb should not distract from interventions with clearer relevance:
- maintain a regular sleep and waking schedule;
- seek assessment for snoring, witnessed breathing pauses, or severe daytime sleepiness;
- review caffeine, alcohol, nicotine, and stimulant use;
- eat enough for training and daily demands;
- include recovery in exercise programming;
- use evidence-based psychological support for persistent anxiety, trauma, or depression;
- review medicines and health conditions with a clinician;
- seek urgent help for crisis symptoms or thoughts of self-harm.
These measures do not depend on the theory that one hormone explains every symptom.
Safety and interactions
The safety record of a particular short-term extract cannot be assumed for every root product, dose, or duration. Botanical identity, contamination, adulteration, and individual susceptibility all matter.
Consult a qualified clinician before use if you have an endocrine disorder, significant liver or kidney disease, cardiovascular symptoms, a hormone-sensitive condition, or a psychiatric condition; if you take prescription medicines; or if you are pregnant, breastfeeding, or trying to conceive.
Do not stop corticosteroids or other prescribed medication in order to use Tongkat Ali. Abruptly stopping corticosteroids can be dangerous. The claim that an herb “lowers cortisol naturally” is not a basis for changing treatment.
How to assess a cortisol claim
Ask the seller or author:
- Is the evidence from humans?
- Was cortisol the predefined outcome?
- How and when was it measured?
- Was there a placebo group?
- What exact extract or plant preparation was used?
- Is the sold product compositionally connected to that intervention?
- Is there a batch-specific assay?
- Is a short biomarker change being expanded into claims about sleep, fat loss, libido, or performance?
- Are exact percentages presented without uncertainty or study context?
If these questions are unanswered, “clinically proven to lower cortisol” is not a responsible description.
What can honestly be concluded
There is limited human research on particular Tongkat Ali extracts and stress-related outcomes. It is reasonable to say that those findings justify further study. It is not reasonable to claim that dried root tea has been shown to lower cortisol, restore a hormone ratio, or treat burnout.
Our current product is a dried root for traditional brewing. It is not the standardized intervention used in the frequently discussed trial. We have no published batch eurycomanone percentage and no product-specific cortisol data. That uncertainty should remain visible.
Readers who value the traditional preparation can review the root product without treating it as a proven stress or endocrine therapy.
Related reading
Frequently Asked Questions
Scientific research and product-specific testing answer different questions. See Product Batch Testing.