Home Ingredients Black Ginger (Kaempferia parviflora / Krachaidum / Thai Ginseng)
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Black Ginger (Kaempferia parviflora / Krachaidum / Thai Ginseng)

Kaempferia parviflora Wall. ex Baker (Zingiberaceae)
Evidence Level
Moderate
3 Clinical Trials
8 Documented Benefits
3/5 Evidence Score

Kaempferia parviflora (also called Black Ginger, Krachaidum, or Thai Ginseng) is a traditional Thai medicinal plant with growing clinical evidence for athletic performance, cardiovascular health, and erectile function. The active compounds are methoxyflavones — polymethoxyflavones unique to this plant that inhibit phosphodiesterase-5 (the same enzyme target as sildenafil), activate AMPK, and have anti-inflammatory effects. Clinical trials show improvements in exercise capacity, fat oxidation, grip strength in older adults, and modest improvements in erectile function. Also being investigated for cognitive support and metabolic health. The honest framing: an evidence-supported botanical with multiple plausible mechanisms; effects on exercise performance and erectile function are modest but real, and the safety profile is good for an emerging botanical with several decades of traditional use.

Studied Dose 100-180 mg/day standardized extract (5-7% methoxyflavones); athletic 90-180 mg; erectile function 100 mg twice daily.
Active Compound 5,7-dimethoxyflavone (5,7-DMF, primary marker), 3,5,7-trimethoxyflavone, 5-hydroxy-3,7-dimethoxyflavone, polymethoxyflavones; standardized to 5% 5,7-DMF.

Benefits

Exercise capacity and physical performance

Clinical trials show improvements in exercise capacity, time to exhaustion, and grip strength with Kaempferia parviflora supplementation in healthy and older adults. Effects build over weeks of consistent use combined with training.

Supported by Trial 2, Trial 3

Erectile function improvement

Clinical trials in men with mild erectile dysfunction show modest improvements in erectile function with Kaempferia parviflora. Mechanism includes phosphodiesterase-5 inhibition — the same target as sildenafil but with smaller effects.

Supported by Trial 2, Trial 1

Fat oxidation and energy metabolism

Methoxyflavones activate AMPK and support fat oxidation, particularly during exercise. Clinical trials show modest improvements in body composition over weeks of supplementation combined with physical activity.

Supported by Trial 3, Trial 2

Grip strength in older adults

Trials in older adults show improvements in grip strength — a marker of overall muscle function and predictor of longevity — with Kaempferia parviflora supplementation over months of use.

Supported by Trial 2, Trial 1

PDE5 inhibition mechanism

Methoxyflavones inhibit phosphodiesterase-5, increasing cGMP levels and producing vasodilatory effects. Same mechanism as sildenafil (Viagra) but with smaller effect sizes — natural support rather than equivalent pharmaceutical action.

Cardiovascular function support

PDE5 inhibition extends beyond erectile applications to general endothelial function and cardiovascular health. Emerging evidence supports broader cardiovascular benefits, though smaller than dedicated cardiovascular interventions.

Supported by Trial 2, Trial 1

AMPK activation for metabolic effects

Beyond PDE5, methoxyflavones activate AMPK — the same pathway as metformin and berberine. Supports the metabolic and exercise performance benefits seen across clinical trials.

Supported by Trial 2, Trial 3

Generally well-tolerated

Clinical trials show good tolerability with side effects no more frequent than placebo. Decades of traditional Thai use support a reasonable safety profile, though long-term high-dose safety data is still emerging.

Supported by Trial 2, Trial 1

Mechanism of action

1

PDE-5 inhibition (sildenafil-like mechanism)

Polymethoxyflavones inhibit phosphodiesterase-5 — the same target as sildenafil and other prescription ED medications. Mechanism is the foundation for the ED and sexual function effects. Theoretical additive interaction with prescription PDE-5 inhibitors warrants caution.

2

Cellular energy metabolism enhancement

Increased cellular energy metabolism contributes to improved physical fitness performance and muscular endurance. Mechanism distinct from caffeine-style stimulant pathways.

3

Brown adipose tissue activation and thermogenesis

BAT activation evidence supports a thermogenic mechanism distinct from caffeine-based thermogenics. Methodological quality of the underlying trial was limited (Jadad 1) — interesting mechanism awaiting better-designed human trials.

4

Polymethoxyflavone bioactivity (5,7-DMF)

Methoxylation distinguishes from typical flavonoids — enhances oral bioavailability, membrane permeability, and diverse pharmacological activities. 12 different methoxyflavones identified. 5,7-DMF is the primary bioavailability marker.

5

Anti-inflammatory NF-κB pathway

NF-κB pathway suppression contributes anti-inflammatory effects — relevant to the osteoarthritis indication in the literature.

6

Testosterone biosynthesis support

Mouse testis-derived cell evidence — preclinical testosterone biosynthesis support. Mechanistic basis for the men's-health positioning, though human testosterone outcomes have not been demonstrated.

7

Adipocyte hypertrophy suppression

Adipocyte hypertrophy suppression supports the anti-obesity research signal. Preclinical mechanism.

Clinical trials

1
K. parviflora ED Pilot

Clinical evidence on Black Ginger (Kaempferia parviflora / Krachaidum / Thai Ginseng) for the indications and outcomes described.

13 men

Stein RA et al. 2018 (J Integr Med 16(4):249-254). Pilot study in 13 men with self-reported mild ED. 100 mg/day standardized 5% 5,7-DMF × 30 days. 61.5% of participants improved erections. Defines the standardized 5% 5,7-DMF dose for ED indication.

2
K. parviflora Evidence Review of 7 Clinical Trial

Clinical evidence on Black Ginger (Kaempferia parviflora / Krachaidum / Thai Ginseng) for the indications and outcomes described.

Clinical population described in trial publication.

Saokaew S et al. 2017. Evidence review of 7 clinical trials (mostly Jadad scale 3/5 quality). Multi-indication evidence: sexual function, athletic performance, osteoarthritis, glucose metabolism. Methodologically robust review rare among aphrodisiac botanicals.

3
Black Ginger Physical Fitness + Endurance Clinical Trial

Clinical evidence on Black Ginger (Kaempferia parviflora / Krachaidum / Thai Ginseng) for the indications and outcomes described.

Clinical population described in trial publication.

Toda K et al. 2016 (Heliyon 2(5):e00115). Black ginger extract increases physical fitness performance and muscular endurance via inflammation and energy metabolism mechanisms. Athletic performance evidence.

Side effects and drug interactions

Common Potential side effects

Generally well-tolerated at typical doses.
Mild GI upset (rare).
Theoretical mild stimulant effects (energy ingredient).
Pregnancy/lactation: avoid (limited data + theoretical hormonal effects).
Allergic reactions in ginger family (Zingiberaceae) sensitive individuals (rare).
Long-term safety: extensive Thai traditional use + systematic review evidence supportive at typical doses.
High doses concerning — limited safety data above 200 mg/day.

Important Drug interactions

PDE-5 inhibitors (sildenafil/Viagra, tadalafil/Cialis): theoretical additive PDE-5 inhibition — caution; consult physician before combining.
Antihypertensives: theoretical mild additive vasodilatory effects.
Anticoagulants: theoretical mild antiplatelet effects.
Diabetes medications: theoretical glucose metabolism effects.
Most medications: well-tolerated at typical doses.
Stimulants: caution due to mild thermogenic/energy effects.

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Frequently asked questions about Black Ginger (Kaempferia parviflora / Krachaidum / Thai Ginseng)

What is Kaempferia parviflora (black ginger) used for?

Kaempferia parviflora, or black ginger (Thai black ginger), is a rhizome used in Thai tradition for energy, stamina, male vitality, and athletic and metabolic support. It contains methoxyflavones as active compounds.

What is black ginger good for?

It is studied for exercise performance and endurance, male sexual function, and metabolic support, with some promising small human studies. It is popular in energy and vitality formulas.

How much black ginger should I take?

Studies use standardized extracts, often around 25 to 100 mg per day; follow product labeling. It is taken as an extract rather than as a culinary spice.

Is Kaempferia parviflora safe?

It is generally reported as well tolerated in studies. As with many vitality herbs, long-term human data is limited, so use as directed, and those on medication or with medical conditions should check with a doctor.

What is Black Ginger?

Kaempferia parviflora (also called Black Ginger, Krachaidum, or Thai Ginseng) is a traditional Thai medicinal plant with growing clinical evidence for athletic performance, cardiovascular health, and erectile function.

What is Black Ginger used for?

Black Ginger is researched primarily for Libido Support, Athletic Performance, and Men's Health. Clinical trials show improvements in exercise capacity, time to exhaustion, and grip strength with Kaempferia parviflora supplementation in healthy and older adults. Effects build over weeks of consistent use combined with training.

What is the recommended dosage of Black Ginger?

The clinically studied dose is 100-180 mg/day standardized extract (5-7% methoxyflavones); athletic 90-180 mg; erectile function 100 mg twice daily. Always follow the product label and check with a healthcare provider for personal advice.

Is Black Ginger safe, and does it have side effects?

For most healthy adults, Black Ginger is well tolerated at studied doses. Reported effects can include: Generally well-tolerated at typical doses. Mild GI upset (rare). It may also interact with some medications. Black Ginger is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Black Ginger interact with any medications?

Possible interactions include: PDE-5 inhibitors (sildenafil/Viagra, tadalafil/Cialis): theoretical additive PDE-5 inhibition — caution; consult physician before combining. Antihypertensives: theoretical mild additive vasodilatory effects. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Black Ginger?

NutraSmarts rates the evidence for Black Ginger as Moderate (3 out of 5). It is backed by 3 clinical trials and 6 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(6 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Na Takuathung M, Klinjan P, Koonrungsesomboon N. A systematic review and meta-analysis of animal and human studies demonstrates the beneficial effects of Kaempferia parviflora on metabolic syndrome and erectile dysfunction. Nutr Res. 2024;122:80-91. doi: 10.1016/j.nutres.2023.12.001.PubMedUsed to support: Systematic review and meta-analysis of animal and human studies supporting black ginger for physical performance and metabolic measures. The strongest synthesis behind the athletic and metabolic uses.
  2. Sripanidkulchai B, Promthep K, Tuntiyasawasdikul S, Tabboon P, Areemit R. Supplementation of Kaempferia parviflora Extract Enhances Physical Fitness and Modulates Parameters of Heart Rate Variability in Adolescent Student-Athletes: A Randomized, Double-Blind, Placebo-Controlled Clinical Study. J Diet Suppl. 2022;19(2):149-167. doi: 10.1080/19390211.2020.1852356.PubMedUsed to support: Randomized controlled trial in which Kaempferia parviflora supplementation enhanced physical fitness and modulated metabolic parameters. Supports the athletic-performance use.
  3. Promthep K, Eungpinichpong W, Sripanidkulchai B, Chatchawan U. Effect of Kaempferia parviflora Extract on Physical Fitness of Soccer Players: A Randomized Double-Blind Placebo-Controlled Trial. Med Sci Monit Basic Res. 2015;21:100-8. doi: 10.12659/MSMBR.894301.PubMedUsed to support: Randomized double-blind trial reporting improved physical fitness in soccer players taking black ginger. Adds controlled support for the performance use.
  4. Jacob J, Gopi S, Divya C. A Randomized Single Dose Parallel Study on Enhancement of Nitric Oxide in Serum and Saliva with the Use of Natural Sports Supplement in Healthy Adults. J Diet Suppl. 2018;15(2):161-172. doi: 10.1080/19390211.2017.1331944.PubMedUsed to support: Randomized single-dose trial in which black ginger raised serum and salivary nitric oxide, the proposed mechanism for its circulation and performance effects. Supports the mechanism and blood-flow framing.
  5. Wattanathorn J, Muchimapura S, Tong-Un T, Saenghong N, Thukhum-Mee W, Sripanidkulchai B. Positive Modulation Effect of 8-Week Consumption of Kaempferia parviflora on Health-Related Physical Fitness and Oxidative Status in Healthy Elderly Volunteers. Evid Based Complement Alternat Med. 2012;2012:732816. doi: 10.1155/2012/732816.PubMedUsed to support: Study of 8 weeks of black ginger reporting positive modulation of health-related physical fitness. Supports the athletic use.
  6. Wasuntarawat C, Pengnet S, Walaikavinan N, Kamkaew N, Bualoang T, Toskulkao C, McConell G. No effect of acute ingestion of Thai ginseng (Kaempferia parviflora) on sprint and endurance exercise performance in humans. J Sports Sci. 2010;28(11):1243-50. doi: 10.1080/02640414.2010.506221.PubMedUsed to support: Randomized trial that found no effect of a single dose of black ginger on sprint or endurance exercise. Included for balance: benefits appear with longer supplementation, not acute dosing.