Testosterone declines with age. Here's what supporting it actually takes.
Testosterone declines at roughly 1-2% per year after age 30. By 45, that cumulative loss adds up, and it shows up as fatigue, body composition changes, reduced drive, slower recovery, and mood shifts that a lot of people just chalk up to "getting older."
Testosterone isn't a fixed number, it's a system with multiple biological levers. Eurycomax is designed to work several of them at once, starting with the same root traditionally used for generations.
We Start With The Root. Then We Optimize It.
Eurycoma longifolia has a long history of traditional use in Southeast Asia. Eurycomax begins with that same root, then adds what tradition alone can't: standardized extraction and independent, lab-published testing on every batch.
Most of your testosterone is locked up and biologically inactive.
About 60-70% of total testosterone is bound to SHBG and can't reach androgen receptors. By targeting SHBG through two independent pathways, Tongkat Ali and boron, Eurycomax is formulated to shift more testosterone into its free, bioavailable form: the fraction that actually does something in the body.
A standard bloodwork panel reporting "total testosterone" doesn't tell you this part of the story. Free testosterone does.
A root with a long history and a growing body of modern research.
Eurycoma longifolia, commonly known as Tongkat Ali (or pasak bumi), is a flowering plant native to Indonesia, Malaysia, and other parts of Southeast Asia. Its root has a long history of use in traditional Southeast Asian medicine, where it was used for a range of purposes including general vitality and male wellness.
Traditional use is a starting point, not evidence of clinical efficacy on its own. Modern research, laboratory, animal, and a smaller number of human clinical studies, has focused primarily on the root's relationship to testosterone levels, stress hormone (cortisol) balance, and physical performance markers. Both halves of that story matter to how we built Eurycomax.
Generations of traditional use
Long used in Southeast Asian traditional medicine for general vitality and male wellness - historical context, not a clinical claim.
Eurycomanone, identified
The most extensively studied constituent of the root, and the marker compound labs use to verify potency and consistency.
Modern lab testing, published
Independent UPLC testing confirms what's actually in a given batch - the step traditional use alone can't provide.
Three steps separate the raw plant from a verified dose.
Alcohol-based extraction concentrates certain compounds efficiently but can lose water-soluble constituents along the way. Water extraction preserves a broader spectrum of compounds but is harder to standardize precisely. Eurycomax uses both, in sequence.
Raw Root
Eurycoma longifolia root, correctly identified at the species level and sourced from its native range - the same root used in traditional preparations for generations.
Dual Extraction
A cold water ultrasonic extract preserves a broader spectrum of water-soluble compounds; a separate standardized extract guarantees a consistent, lab-verified eurycomanone concentration.
Standardized, Tested Complex
The two extracts combine into an 850mg total complex, declaring 7mg of eurycomanone per serving - then independently lab-tested to confirm it.
Why one extraction method was never enough.
Neither extraction method alone tells the whole story. Eurycomax combines both, each doing a distinct job.
Cold Water Ultrasonic Extract
Preserves a broader spectrum of water-soluble compounds - and additional eurycomanone - that standard alcohol extraction can lose along the way.
Standardized Extract
Guarantees a consistent, lab-verified eurycomanone concentration in every batch - the number a Certificate of Analysis is built to confirm.
Two bottles can say the same thing on the label and mean very different things.
A supplement label can legally say "Tongkat Ali" without stating the species, the plant part, the extraction method, the concentration, or whether the finished product was ever tested. That gap is exactly what independent testing is built to close.
Which species?
"Tongkat Ali" refers to Eurycoma longifolia - but look-alike or unrelated botanicals can be marketed under the same common name.
Which part of the plant?
Root, root bark, stem, or leaf material can all end up in a "Tongkat Ali" product. The compounds of interest are concentrated in the root.
Standardized, or just "extract"?
Standardization means a specific compound is guaranteed present at a specific, lab-verified percentage - not just "contains extract."
Was it tested?
Third-party testing is the only way to confirm identity and potency actually match the label - and whether the results are published.
Is there a published COA?
A Certificate of Analysis, tied to a specific lot number, is the difference between a claim and a verification.
How does it actually measure up?
See the real, lab-tested eurycomanone-per-dose numbers - Eurycomax included - in the Testing section below.
Tradition told us where to look. Lab testing tells us what's actually in the bottle.
Eurycoma longifolia, root.
- Generations of traditional use in Southeast Asian medicine, as a starting point for what to study further.
- A root system rich in quassinoid compounds, eurycomanone chief among them.
- The raw material every Eurycomax batch traces back to - nothing synthetic substituted in.
Identity, potency, and purity - verified.
- Independent UPLC lab testing confirms eurycomanone content batch by batch, rather than relying on a label claim alone.
- A published Certificate of Analysis (COA), tied to a specific lot number.
- 7mg of verified eurycomanone per serving - over 11x the competitor average (0.6mg), confirmed by in-house and 3rd-party UPLC-PDA chromatography.
The number that actually matters: eurycomanone content.
Standardization claims are only as good as the lab work behind them. In independent testing of ten Tongkat Ali brands, the average eurycomanone found per dose was just 0.6mg, two brands had zero detectable eurycomanone, and several tested below the native concentration of raw, unprocessed root. Eurycomax delivers 7mg of verified eurycomanone per serving, over 11x that competitor average, confirmed by in-house and 3rd-party UPLC-PDA chromatography, with a published COA on every batch.
Below is the brand-by-brand detail behind that average: our most recent published testing round (Q1 2025 retail batches), measured via UPLC. In this specific round, Eurycomax measured 8.18mg per dose, over 4.5x the next-highest individual competitor tested, at roughly 79% lower cost per milligram than that competitor.
Figures above are milligrams of eurycomanone per dose, measured by UPLC lab testing of retail batches purchased in Q1 2025. Cost-per-milligram figures for each brand appear in the data table below. We're expanding this testing to more competitor brands through direct purchase-and-test in future rounds; results will be added here as they're confirmed.
What We Measure
Eurycomanone concentration, verified via independent UPLC laboratory analysis - the standard marker compound for Tongkat Ali potency and standardization claims.
Why It Matters
It's the most objective, lab-verifiable way to check whether a "standardized" or "potent" claim on a label actually holds up.
How We Report It
We only publish results for products that have actually been tested, with the lab, method, and date disclosed. Untested products are marked pending, never estimated.
| Brand | Eurycomanone (mg/dose) | Cost / mg Eurycomanone | Test Type | Test Round | Status |
|---|---|---|---|---|---|
| EurycomaxNootropics Depot | 8.18mg | $0.13 | 3rd-party UPLC | Q1 2025 | Tested |
| Akarali Euryprep 200 | 1.81mg | $0.61 | 3rd-party UPLC | Q1 2025 | Tested |
| Double Wood (LJ100) | 1.05mg | $0.32 | 3rd-party UPLC | Q1 2025 | Tested |
| Solaray | 0.33mg | $0.86 | 3rd-party UPLC | Q1 2025 | Tested |
| Momentous | 0.30mg | $2.22 | 3rd-party UPLC | Q1 2025 | Tested |
| Lost Empire Herbs | 0.13mg | $5.77 | 3rd-party UPLC | Q1 2025 | Tested |
| Satoomi | 0.00mg | n/a - none detected | 3rd-party UPLC | Q1 2025 | Tested |
| Mars MenLabel: 1000mg, unstandardized | 0.00mg | n/a - none detected | 3rd-party UPLC | Q1 2025 | Tested |
Scroll table horizontally to see all columns →
Testosterone is a system, not a single number.
Research on Tongkat Ali and related ingredients in Eurycomax has explored several distinct biological pathways rather than a single mechanism. These are areas of active study, not guaranteed effects in every individual.
Aromatase Inhibition
+Studied for its relationship to the conversion of testosterone into estrogen.
Referenced alongside Tongkat Ali & testosterone-related outcome research (Leitão et al., 2021; Leisegang et al., 2022) - mechanistic, not product-specific, evidence.
HPG Axis Signaling
+Explores LH/FSH signaling along the hypothalamic-pituitary-gonadal axis.
Part of the same hormonal-axis research reviewed in Leitão et al., 2021 and Leisegang et al., 2022 - see Clinical Evidence below for the full evidence-tier breakdown.
SHBG Interaction
+Sex hormone-binding globulin (SHBG) binds most circulating testosterone, leaving only a fraction free and bioavailable.
Explored in more depth in the Total vs. Free Testosterone section above - SHBG is the single biggest lever between a "total T" number and what's actually bioavailable.
Cortisol Regulation
+Studied as an adaptogen in relation to the body's stress-hormone response.
Talbott et al., 2013 reported a 16% reduction in cortisol alongside improved mood scores over a 4-week period - see the stats above.
Leydig Cell Signaling
+Explored in relation to intracellular signaling pathways in testosterone-producing cells.
Mechanistic/in-vitro research on how Tongkat Ali constituents may interact with Leydig cell signaling - see the evidence-tier framework below for what that level of evidence does and doesn't establish.
Prolactin Levels
+Studied in relation to dopaminergic activity and prolactin balance.
An area of ongoing mechanistic research rather than a product-specific clinical finding for Eurycomax itself.
Not all evidence carries the same weight.
When we say "research suggests," it matters what kind of research. Here's the hierarchy we use when describing evidence for Eurycomax and its ingredients.
Cited research referenced by Nootropics Depot for Eurycomax ingredients includes: Leitão et al., 2021; Leisegang et al., 2022 (Tongkat Ali & testosterone-related outcomes); Talbott et al., 2013 (cortisol balance); Shukla et al., 2006, Katzenschlager et al., 2004, Yadav et al., 2014 (Mucuna pruriens); Marx et al., 2009, Fox et al., 2022 (pregnenolone); Rondanelli et al., 2020, Penland et al., 1998 (boron).
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Individual results vary.
Eight ingredients, engineered around one hormonal system.
A single-extract Tongkat Ali does one job well: deliver a standardized dose of eurycomanone. We make one of those too. Eurycomax is built for a different job: a dual-extract Tongkat Ali core plus supporting ingredients, each chosen for a distinct pathway in the same hormonal system, and dosed to be taken together every day.
Cold Water Ultrasonic Extract
Preserves a broader spectrum of water-soluble compounds - and additional eurycomanone - that standard alcohol extraction can lose.
Cold Water Ultrasonic Extract
Ultrasonic-assisted extraction uses high-frequency sound waves to help break the root's cell walls down at lower temperatures than standard hot-water processing - intended to preserve heat-sensitive quassinoids alongside eurycomanone.
Standardized Extract
Guarantees a consistent, lab-verified eurycomanone concentration every batch.
Standardized Extract
Standardization is confirmed via UPLC-PDA chromatography against a reference eurycomanone standard - the same testing method referenced in the Eurycomanone Testing section above.
Mucuna pruriens
A legume seed extract studied for its relationship to dopamine precursor activity, mood, and motivation.
Mucuna pruriens
L-DOPA is the direct metabolic precursor to dopamine. Research on Mucuna pruriens and L-DOPA includes Shukla et al., 2006; Katzenschlager et al., 2004; and Yadav et al., 2014 - ingredient-level evidence, not a product-specific clinical finding for Eurycomax.
Epimedium brevicornum
Also known as Horny Goat Weed; standardized to icariin content.
Epimedium brevicornum
Icariin has been studied in vitro for its relationship to nitric oxide signaling - mechanistic research that explains a plausible pathway, not a guaranteed outcome in people.
Pregnenolone
A precursor hormone studied in relation to cognitive function and stress response.
Pregnenolone
Pregnenolone sits upstream of both cortisol and DHEA production. Cited research includes Marx et al., 2009 and Fox et al., 2022 - ingredient-level, not product-specific, evidence.
Boron + Iodine
Boron is studied for its relationship to bone health and hormone metabolism; iodine supports normal thyroid function.
Boron + Iodine
Boron research referenced by Nootropics Depot includes Rondanelli et al., 2020 and Penland et al., 1998. Iodine is an essential mineral required for normal thyroid hormone production.
Sodium Caprate (C10)
Included to support absorption of the broader formula rather than as an active hormonal ingredient on its own.
Sodium Caprate (C10)
A medium-chain fatty acid derivative studied as a permeation enhancer - its role here is formulation support, not a hormonal effect of its own.
Recommended Start
Response to Tongkat Ali varies by individual. Because the formula is potent, we recommend starting with 1 capsule and adjusting from there based on how you respond.
Most people shopping for Tongkat Ali aren't chasing a lab result. They're chasing energy, drive, and the sense that their body is still working for them.
The lab work exists so that when you feel a difference, you know exactly what's behind it.
Every lot gets a published Certificate of Analysis.
This is Eurycomax's actual Certificate of Analysis (CoA #ND-25-1363), run through an ISO/IEC-accredited third-party lab - identity testing on every active ingredient, potency results, and physical testing, all tied to this specific production lot and batch.
Nootropics Depot publishes a lot-specific COA for every product it sells. Eurycomax's current COA is available at checkout and via the QR code on the bottle.
What verified buyers are saying.
Customer reviews, not clinical outcomes - individual results vary, and response to Tongkat Ali differs from person to person.
"This stack is badass! Incredible mood lift, incredible boost to libido! Incredible pumps in the gym and a noticeable boost to stamina. I'm am incredibly impressed!"
"It gave me the boost to hit my workouts harder and most important it shook off my laziness. Eurycomax gave me the drive I was missing."
"Steady energy, steady strength. Good product, as expected."
Reviews sourced from verified Eurycomax purchasers. As with any supplement, individual response varies - some people notice a strong effect, others notice little. Reviews describing lab results, prescription-therapy comparisons, or specific onset timing are not included here.
Eurycomax: Optimized Tongkat Ali
A dual-extract, 10% eurycomanone standardized Tongkat Ali formula, stacked with Mucuna pruriens, Epimedium, pregnenolone, boron, and iodine for broader hormonal support.
First-time Eurycomax users
Lowest price per serving
Price, dosing, and formulation reflect the product listing at nootropicsdepot.com at time of writing and may change - always confirm current details on the product page before purchasing.
Questions a skeptical buyer should ask.
What is Tongkat Ali?
Tongkat Ali (Eurycoma longifolia) is a flowering plant native to Southeast Asia. Its root has a long history of traditional use, and has become a common ingredient in natural testosterone support and male vitality products.
What is eurycomanone?
Eurycomanone is a quassinoid compound found in Eurycoma longifolia root, and the most extensively studied constituent of the plant. It's commonly used as the marker compound for standardizing Tongkat Ali extracts.
Does all Tongkat Ali contain the same compounds, in the same amounts?
No. Compound levels vary significantly based on species identification, plant part used, growing conditions, and - most significantly - extraction method and standardization. Two products both labeled "Tongkat Ali" can differ substantially in actual eurycomanone content.
How does Eurycomax compare to a typical single-extract Tongkat Ali product?
Eurycomax combines a 10% eurycomanone standardized extract with a cold water ultrasonic extract, then adds Mucuna pruriens, Epimedium brevicornum (Horny Goat Weed), pregnenolone, iodine, and boron - intended to address the broader hormonal picture rather than a single compound in isolation. In independent UPLC-PDA testing of ten Tongkat Ali brands, Eurycomax measured 7mg of eurycomanone per serving versus a 0.6mg average across the others tested.
Why does Eurycomax use two Tongkat Ali extracts?
Alcohol-based extraction concentrates eurycomanone efficiently but can lose water-soluble constituents along the way; water extraction preserves a broader spectrum of compounds but is harder to standardize precisely. Eurycomax uses a cold water ultrasonic extract for breadth and a 10% standardized extract for guaranteed potency, then combines both into one 850mg complex.
Can I see the Certificate of Analysis (COA)?
Yes. Nootropics Depot publishes a lot-specific COA for every product it sells, including Eurycomax. The current COA is available at checkout and via the QR code on the bottle - see the Testing & Transparency section above for Eurycomax's actual COA (CoA #ND-25-1363).
Can women take Eurycomax?
Nootropics Depot markets Eurycomax as suitable for both men and women. Because the formula includes pregnenolone and hormone-related botanicals, women who are pregnant, nursing, or managing a hormone-sensitive condition should talk to a healthcare provider before use - as should anyone taking medication.
Does Eurycomax work the same way for everyone?
No - and we'd rather say that plainly than oversell it. Response to Tongkat Ali varies significantly by individual; some people notice a strong effect, others notice little to none. Starting with 1 capsule is the best way to gauge your own response before committing to the full serving.
How much Tongkat Ali should someone take?
Eurycomax's labeled serving is 2 capsules daily, taken in the morning with or without food. Because the formula contains potent ingredients including pregnenolone and two Tongkat Ali extracts, starting with 1 capsule is recommended.
Is Tongkat Ali clinically studied?
Yes, though the body of human clinical research is smaller than for many mainstream supplements, and many available trials involve modest sample sizes and durations. Available research has examined Tongkat Ali's relationship to testosterone levels, cortisol balance, and physical performance markers - see the Six Pathways and Clinical Evidence sections above for referenced studies and appropriate caveats.
How quickly does it work?
Individual response to Eurycomax varies significantly from person to person - our own customer feedback reflects that split directly, with some people noticing a strong effect and others noticing little to none. Because of that range, we don't publish a specific timeline for when to expect results. Take it consistently as directed, starting with the recommended 1-capsule dose, and adjust from there based on how you personally respond.
Can Eurycomax be stacked with other Nootropics Depot products?
Per Nootropics Depot, Eurycomax can be stacked with Cistamax, as the two are formulated to work through different pathways. Consult the current product page or a healthcare provider for guidance specific to your situation, especially if you take medication.
Start with the root. Trust the testing.
Real Eurycoma longifolia root, a standardized dual-extract, and a Certificate of Analysis published for every lot - that's Eurycomax.
