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Herb Profile
Tongkat Ali
Eurycoma longifolia
Tongkat Ali (Eurycoma longifolia) carries a Grade C rating — limited evidence.
Last reviewed: •4 sources citedReport a correctionProfile-wide ·C Limited
Use extra caution — May cause insomnia/restlessness; avoid pregnancy and hormone sensitive conditions; caution with stimulant or endocrine active regimens. Details
- Evidence
- Limited Evidence
- Typical onset
- Varies by prep
- Safety rating
- High caution
- Best for
- Testosterone Support, Libido, Adaptogen, Stress
Verdict: Tongkat AliMaybe
Best for
- Stress paired with fatigue or low drive
- Male vitality and energy interest
- Stress–hormone balance
Not ideal for
- Acute anxiety or a same-day calm
- A sleep aid
- Hormone-sensitive conditions without medical guidance
- Evidence confidence
- Limited–moderate — small trials for stress and hormonal markers
- Expected onset
- 2–4 weeks
- Give it
- 4–8 weeks
Bottom line: A traditional adaptogen with small trials suggesting it eases stress and nudges hormonal markers — promising but under-studied, and product quality varies a lot.
Safety: Product adulteration is a known issue; choose tested brands. Use caution with hormone-sensitive conditions and discuss with a clinician if you take medication.
On the evidence: Small human trials for stress, mood, and testosterone; larger, independent studies are lacking.
Consider instead: Ashwagandha — for the best-studied stress adaptogen
How strong is the evidence?Limited–moderate
Why not higher
- Trials are small and often industry-linked
- Product quality and standardization vary widely
- Independent replication is limited
Why not lower
- Several randomized trials point toward reduced stress and improved hormonal markers
- A coherent adaptogenic rationale
Practical takeaway: Reasonable to trial for stress-with-fatigue over several weeks using a tested product. For the best-studied stress adaptogen, start with ashwagandha.
Next stepsWhere to go next — guides & comparisons
Start here
New to this? Begin with Best adaptogens for stress.
Continue reading
- If you want help with anxiety or stress → Anxiety & stress guides
- If you want to browse more herbs → All herbs
Safety
Safety & Cautions
May cause insomnia/restlessness; avoid pregnancy and hormone sensitive conditions; caution with stimulant or endocrine active regimens.
High caution
Caution level: High. Multiple caution categories apply, or the record uses avoid/contraindication language.
- Interaction-AwareMedication or interaction context is explicitly noted.
- Liver-SensitiveLiver-related caution language appears in the profile.
- Hormonal Activity ContextHormone-adjacent wording is present and should be interpreted carefully.
- Stimulant-Like ProfileStimulant-like or activating caution language is present.
Detailed safety fields
Safety classifications
- Interaction-Aware: Medication or interaction context is explicitly noted.
- Liver-Sensitive: Liver-related caution language appears in the profile.
- Hormonal Activity Context: Hormone-adjacent wording is present and should be interpreted carefully.
- Stimulant-Like Profile: Stimulant-like or activating caution language is present.
- Anticoagulant Caution: Bleeding or anticoagulant-adjacent caution language is present.
- Pregnancy/Breastfeeding Caution: Pregnancy or breastfeeding caution language is present.
Full safety note
- May cause insomnia/restlessness; avoid pregnancy and hormone sensitive conditions; caution with stimulant or endocrine active regimens.
Safety labels
- Interaction-Aware
- Liver-Sensitive
- Hormonal Activity Context
- Stimulant-Like Profile
- Anticoagulant Caution
- Pregnancy/Breastfeeding Caution
Evidence-based safety
Caution when combined
Severity and certainty are shown separately. A high-priority caution can still be theoretical: these pairings are screened from shared contraindication mechanisms and are not automatically documented clinical interactions. Provenance identifies the source fields that produced each flag; it does not upgrade the certainty of the pairwise claim.
High-Priority Caution
147 flagged pairingsBleeding / anticoagulant risk
High-Priority Caution
147 flagged pairingsBleeding / anticoagulant risk
Representative pairings are shown below. Large mechanism groups are intentionally summarized to keep profiles focused and crawl-efficient.
Bleeding / anticoagulant riskCertainty: Theoretical
Data provenance recorded for 147 of 147 pairings in this mechanism group.
- aescin — Theoretical interaction certainty
- Aged Garlic Extract — Theoretical interaction certainty
- ajoene — Theoretical interaction certainty
- Ajwain — Theoretical interaction certainty
- Allicin — Theoretical interaction certainty
- Garlic — Theoretical interaction certainty
- American Ginseng Extract — Theoretical interaction certainty
- Andrographis — Theoretical interaction certainty
- Angelica Archangelica — Theoretical interaction certainty
- Angelica Dahurica — Theoretical interaction certainty
- Angelica Pubescens — Theoretical interaction certainty
- Angelica Root — Theoretical interaction certainty
+135 more pairings share this mechanism. Use the Safety Checker to review a specific combination.
Moderate Caution
110 flagged pairingsBlood-sugar lowering
Moderate Caution
110 flagged pairingsBlood-sugar lowering
Representative pairings are shown below. Large mechanism groups are intentionally summarized to keep profiles focused and crawl-efficient.
Blood-sugar loweringCertainty: Theoretical
Data provenance recorded for 110 of 110 pairings in this mechanism group.
- Acarbose — Theoretical interaction certainty
- ajoene — Theoretical interaction certainty
- Allicin — Theoretical interaction certainty
- Aloe Vera — Theoretical interaction certainty
- Alpha-Lipoic Acid — Theoretical interaction certainty
- American Ginseng Extract — Theoretical interaction certainty
- Andrographis — Theoretical interaction certainty
- Anemarrhena Asphodeloides — Theoretical interaction certainty
- Tarragon — Theoretical interaction certainty
- Ashoka — Theoretical interaction certainty
- Astragalus — Theoretical interaction certainty
- Astragalus Membranaceus — Theoretical interaction certainty
+98 more pairings share this mechanism. Use the Safety Checker to review a specific combination.
Evidence
Evidence Summary
Evidence lens
Read as directional context, not settled clinical proof.
LimitedLimited Evidence
Human clinical evidence: Present in source signals
Mechanistic / preclinical: Mechanism mapped — Hormonal Signaling Context · Stress Response Modulation
Research maturity: Emerging research — Long Term Human Evidence May Be Limited.
Safety boundary: Safety note available — May cause insomnia/restlessness; avoid pregnancy and hormone sensitive conditions; caution with stimulant or endocrine active regimens.
This profile cites 4 human studies.
Study design details
Evidence Grade
Grade C: Limited Evidence
Evaluation of methodological rigor, population reach, and evidence alignment.
- Design Match
- Systematic review
- Risk of Bias
- Low
- Consistency
- Consistent
Strongest recorded design is a systematic review, drawn from 4 recorded studies, 3 in people. No disagreement is recorded across them.
How evidence grades work
Each grade reflects the strength and consistency of published human evidence — not marketing claims. Grades are based on study count, design quality, effect size, consistency, and recency.
- Strong
- Multiple RCTs, consistent direction, adequate effect size
- Moderate
- Some RCTs or consistent observational data in humans
- Preliminary / Mixed
- Animal or in-vitro only, or conflicting human data
- Traditional / Theoretical
- Traditional use only; no controlled human trials
Clinical Study Summaries (4)2 human evidence sources · 1 human trial · ~45 participants across 1 human evidence source with reported N · Consistency not yet classifiable
Filter by study class
Showing 4 of 4 studies.
What the evidence actually shows
This table contains 4 structured sources, including 2 human evidence sources; 1 is a human trial. Across 1 human evidence source with a reported sample size, the approximate participant total is 45; overlapping publications may include some of the same people. Source-to-conclusion relationships are not classified in this structured set, so consistency is not yet classifiable.
Profile-wide evidence grade: see the profile grade above · Confidence: not separately assigned
What would change our conclusion?
Larger, well-controlled human trials using comparable populations, doses, preparations, and clinically meaningful outcomes could materially strengthen or weaken this conclusion. Replication in a different population or a high-quality synthesis resolving current disagreement could also materially change confidence.
| Study | Design | N | Dose | Duration | Population | Outcome | Result & magnitude | Source |
|---|---|---|---|---|---|---|---|---|
Leisegang K et al. · Medicina (Kaunas) · 2022 Background | Systematic review Uses a predefined method to find and evaluate relevant studies, but may or may not pool their results statistically. | — | — | — | — | — | — | PubMed → |
Leitão AE et al. · Maturitas · 2021 Background | Randomized controlled trial Randomly assigns participants to interventions or controls, reducing many sources of bias when the trial is conducted well. | n=45 | — | — | — | — | — | PubMed → |
PubMed indexed authors · 2012 Background | Narrative review Summarizes selected literature without the full prespecified search and selection methods of a systematic review. | — | — | — | — | — | — | PubMed → |
PubMed · Phytother Res · 2014 Background | Other / unclear The study design is not yet classified clearly enough to infer its place in the evidence hierarchy. | — | — | — | — | — | — | PubMed → |
Dosing & Timing
- No standardized dose
- Preparation specific; use standardized product label for Root/rhizome preparations are commonly used as teas and require source backed dosage review before therapeutic claims.
How Tongkat Ali works
Simplified mechanism pathway based on preclinical and pharmacological evidence. Does not confirm clinical efficacy.
Mechanism Pathway — How Tongkat Ali Works
CompoundTarget / ReceptorMechanismEffect / Outcome
Mechanisms & biological pathways
Preclinical pathways. Proposed mechanisms from in vitro and animal research; these do not confirm clinical outcomes in humans.
- Hormonal Signaling Context
- Stress Response Modulation
Compare related active botanicals
Explore botanicals with similar chemistry, effects, or safety considerations in the Botanical Activity Atlas.
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Review available sources for Tongkat Ali
Independent database mapping — evaluated separately from safety and efficacy scores.
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Safety first · Harm reduction
This information is educational and not medical advice. Start low, avoid risky combinations, and consult a licensed clinician before making health decisions—especially if you use medications, have diagnosed conditions, or are pregnant/breastfeeding.
Learn how we evaluate confidence, safety, and intensity on the methodology page.
Editorial Review
Checked against primary sources, cited evidence, and contraindication language before publication. Evidence claims, safety language, and affiliate modules are reviewed independently. Not personal medical advice.
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Botanical profile context
How to interpret Tongkat Ali
Tongkat Ali herb profile with evidence context, key research topics, source notes, safety context, and references presented in an evidence-first format. Use this herb profile as a starting point for evidence review, not as a recommendation to start a new supplement. Botanical products can vary by plant part, extract ratio, standardization, dose, and contaminant testing, so two labels with the same common name may not behave the same way.
When reviewing Tongkat Ali, compare the traditional-use context against the human evidence, mechanism notes, and safety cautions. Pay special attention to pregnancy, breastfeeding, liver or kidney disease, blood-pressure effects, sedation, stimulation, anticoagulant use, antidepressants, and any prescription medication overlap.
For product decisions, prefer transparent labels, named extracts, clear serving sizes, and third-party quality testing. Avoid treating a long list of possible mechanisms as proof that an herb will solve a specific condition.