Source Naturals Tongkat Ali LJ100™ (80 mg • 30 Tablets)
A standardized, clinically studied botanical extract designed to restore healthy testosterone balance, optimize daily stamina, and reduce occasional fatigue.
Medical Fact Check & Quality Notice: This article reviews human clinical research on patented LJ100® Eurycoma longifolia. Consult a qualified physician before using any hormone-modulating botanical.
What Is Tongkat Ali (LJ100™) and How Does It Work?
Tongkat Ali (botanical name: Eurycoma longifolia, commonly called "Longjack") is a slender, flowering shrub native to Southeast Asian rainforests. For generations, traditional practitioners in Malaysia and Indonesia used its taproot to fight fatigue, restore youthful virility, and maintain physical resilience.
In plain English, think of your body's testosterone like money. You have total money (total testosterone) and cash in your pocket that you can spend right now (free, bioavailable testosterone). Much of the testosterone in your bloodstream is trapped by a carrier protein called Sex Hormone-Binding Globulin (SHBG). When trapped, your body cannot put it to work.
Source Naturals uses LJ100™, a patented hot-water extract developed jointly by the Government of Malaysia and Massachusetts Institute of Technology (MIT) researchers. Clinical studies reveal that LJ100™ works through two core physiological pathways:
✓Unlocking Bound Testosterone: Active eurypeptides in LJ100 help release testosterone from SHBG, allowing your muscles, brain, and reproductive tissues to use the free testosterone your body already makes.
✓Lowering the Stress Hormone (Cortisol): When emotional or physical stress runs high, cortisol spikes. High cortisol works like a brake on testosterone. LJ100 helps normalize cortisol, protecting your natural energy and mood from daily burnout.
The Science: Double-Checked Human Clinical Evidence
Unlike generic root powders that only cite rodent tests, the standardized LJ100 extract inside Source Naturals Tongkat Ali has undergone rigorous evaluation in human placebo-controlled trials:
Clinical Trial & Journal
Study Group & Dosage
Key Human Findings
Talbott et al., 2013 Journal of the International Society of Sports Nutrition
(PMID: 23701141)
63 moderately stressed men and women; 200 mg/day for 4 weeks.
Demonstrated a 16% reduction in salivary cortisol and a 37% increase in free testosterone, alongside noticeable decreases in tension (-11%) and anger (-12%).
Tambi et al., 2012 Andrologia
(PMID: 21671978)
76 men with low testosterone (late-onset hypogonadism); 200 mg/day for 1 month.
Normalized serum testosterone in 90.8% of participants, restoring normal youthful hormonal baselines without synthetic interventions.
Henkel et al., 2014 Phytotherapy Research
(PMID: 23754792)
Active senior men and women (ages 57-72); 400 mg/day for 5 weeks.
Produced a significant increase in free and total testosterone, accompanied by notable gains in muscular strength (measured by handgrip force).
Ismail et al., 2012 Evidence-Based Complementary & Alternative Medicine
(PMID: 23198021)
109 men (ages 30-55); 300 mg/day in a 12-week randomized trial.
Documented significant improvements in sexual performance scores, libido, overall physical functioning, and body composition.
Key Everyday Health Benefits for Men
✓ Recharges Healthy Libido & Sexual Confidence
By optimizing free testosterone and supporting healthy pelvic circulation, Tongkat Ali helps reawaken natural desire and overall bedroom satisfaction.
✓ Sustained Physical Energy & Workout Endurance
Traditional herbs often rely on caffeine or synthetic stimulants. Tongkat Ali supports energy at the mitochondrial level, providing steady stamina throughout busy workdays and tough gym sessions without jitters or midday crashes.
✓ Clear Mental Focus Under Daily Pressure
By moderating your salivary cortisol response, LJ100 prevents mental fatigue and irritability from taking over when work, family, or intense training schedules accumulate.
✓ Preserves Lean Muscle Mass
As men age, declining androgen levels make it easier to gain visceral body fat and harder to retain lean muscle. Optimizing free testosterone helps support muscle protein synthesis and faster post-exercise recovery.
Why Standardized LJ100™ Beats Cheap Root Powders
A major reason many men fail to see results with cheap Tongkat Ali supplements on discount marketplaces is lack of standardization. Unprocessed root powders often contain trace actives, filler biomass, or unvetted heavy metals.
Source Naturals features genuine LJ100™, the world's most comprehensively researched Tongkat Ali extract:
✓Patented Water Extraction: LJ100 uses high-tech pressurized hot-water extraction that captures the active fractions while discarding unnecessary woody fibers.
✓Guaranteed Bioactive Profile: Standardized to contain 22% bioactive eurypeptides and 40% glycosaponins for batch-to-batch consistency.
✓Clean & Safe: Independently tested for heavy metals, microbial purity, and adulterants, satisfying strict cGMP manufacturing standards.
Complete Supplement Facts & Ingredient Listing
Supplement Facts
Serving Size: 1 Tablet Servings Per Container: 30 (Also available in 60 Tablets - SKU: SN1674)
Amount Per Serving% Daily ValueEurycoma longifolia Extract (Tongkat Ali LJ100™)80 mg • †
† Daily Value (DV) not established.
Other Ingredients & What They Do:
Microcrystalline Cellulose: A plant-derived dietary fiber used to bind the tablet into shape.
Stearic Acid: A plant-based fatty acid that helps the tablet press smoothly through machinery during manufacturing.
Modified Cellulose Gum: Helps the tablet break down rapidly in the stomach so nutrients are absorbed effectively.
Colloidal Silicon Dioxide: A natural mineral compound that keeps ingredients free-flowing and prevents clumping.
Allergen Information: Contains no yeast, dairy, egg, gluten, corn, soy, or wheat. Free of sugar, starch, salt, preservatives, and artificial colors, flavors, or fragrances. Suitable for vegetarians.
How to Take Source Naturals Tongkat Ali: Dosage & Cycling
Suggested Use: Take 1 tablet twice daily with meals (totaling 160 mg of standardized LJ100 daily).
Timing Tip: Take your first tablet with breakfast and your second tablet with lunch or an early dinner. Because Tongkat Ali supports physical stamina and natural alertness, taking it right before bed may cause mild restlessness in sensitive individuals.
Do You Need to Cycle Tongkat Ali?
Human studies demonstrate that optimal effectiveness develops over 1 to 3 weeks of continuous, uninterrupted daily use. Many herbalists and fitness practitioners recommend a periodic cycling schedule (such as 5 days on, 2 days off, or 4 weeks on, 1 week off) to prevent receptor desensitization and allow your endocrine system to maintain its own natural rhythms.
Safety Information, Warnings & Contraindications
Under strict responsible supplementation guidelines, please read the following safety precautions carefully:
Adult Men Only: This formulation is formulated specifically for adult men. Not for use by women who are pregnant, planning to become pregnant, or breastfeeding.
Hormone-Sensitive Conditions: Do not use if you have a history of prostate cancer, breast cancer, benign prostatic hypertrophy (BPH), or endocrine disorders without physician clearance.
Prescription Medications: If you take prescription drugs, hormone replacement therapy (HRT), immunosuppressants, or diabetes medications (Tongkat Ali may naturally enhance insulin sensitivity), consult your doctor first.
Possible Mild Side Effects: When taken in excess of recommended doses, some users report mild insomnia, irritability, or elevated body heat. Adhere strictly to the labeled dose.
Frequently Asked Questions (FAQ)
How long does it take for Source Naturals Tongkat Ali to start working?
Most men report noticeable changes in daytime energy, mood, and mental stamina within 3 to 7 days. Changes in libido, exercise recovery, and free testosterone balance generally reach full clinical peak within 1 to 3 weeks of consistent, uninterrupted daily use.
What makes patented LJ100™ better than regular Tongkat Ali raw root powder?
Regular raw root powder is simply pulverized wood with variable levels of active ingredients. LJ100 is a patented 100:1 water-extracted concentrate developed with MIT researchers. It is scientifically standardized to deliver exactly 22% eurypeptides and 40% glycosaponins, ensuring verified potency and safety in every tablet.
Will Tongkat Ali shut down my body's natural testosterone production?
No. Synthetic anabolic hormones cause negative feedback loops that shut down natural production. Tongkat Ali is an adaptogen: it works by stimulating your body to synthesize its own hormone precursors and by releasing bound testosterone from SHBG. It maintains your natural endocrine system rather than shutting it down.
Can women use Source Naturals Tongkat Ali?
The Source Naturals formulation is labeled specifically for adult men. While women do produce testosterone and research has explored low-dose Tongkat Ali for active female seniors, women should only consider it under the guidance of a qualified healthcare professional, and it is strictly contraindicated during pregnancy or breastfeeding.
Should I take this supplement with food or on an empty stomach?
Source Naturals recommends taking 1 tablet twice daily with meals. Taking botanical extracts with a meal or snack aids gastrointestinal absorption and prevents the mild stomach sensitivity that can occur when taking potent plant compounds on an empty stomach.
Scientific References & Peer-Reviewed Literature:
Talbott SM, Talbott JA, George A, Pugh M. Effect of Tongkat Ali on stress hormones and psychological mood state in moderately stressed subjects. J Int Soc Sports Nutr. 2013;10(1):28. doi:10.1186/1550-2783-10-28.
Tambi MI, Imran MK, Henkel RR. Standardised water-soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster for managing men with late-onset hypogonadism? Andrologia. 2012;44 Suppl 1:226-230. doi:10.1111/j.1439-0272.2011.01168.x.
Henkel RR, Wang R, Bassett SH, et al. Tongkat Ali as a potential herbal supplement for physically active male and female seniors--a pilot study. Phytother Res. 2014;28(4):544-550. doi:10.1002/ptr.5017.
Ismail SB, Wan Mohammad WM, George A, et al. Randomized Clinical Trial on the Use of PHYSTA Freeze-Dried Water Extract of Eurycoma longifolia for the Improvement of Quality of Life and Sexual Well-Being in Men. Evid Based Complement Alternat Med. 2012;2012:429268. doi:10.1155/2012/429268.
EFSA Panel on Nutrition, Novel Foods and Food Allergens. Safety of Eurycoma longifolia (Tongkat Ali) root extract as a novel food. EFSA Journal. 2021;19(12):e06936.
*Disclaimer: The statements on this page have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always check with your doctor before starting any herbal supplementation program.
