Black Ginger (Kaempferia Parviflora) Supplement Guide: Benefits, Dosage, and Clinical Evidence (2026)

What Is Black Ginger?

Kaempferia parviflora Wall. ex Baker, commonly called black ginger or Thai ginseng (krachai dum in Thai), is a perennial herb in the Zingiberaceae (ginger) family native to Thailand and surrounding regions. The rhizome has a distinctive dark purple-black interior, which distinguishes it from common ginger and turmeric.

Black ginger has a long history in Thai folk medicine as a tonic for stamina and male vitality; researchers studying its PDE5-inhibiting compounds describe it as a plant traditionally used to enhance sexual performance (Temkitthawon et al., 2011).

The plant's chemistry is dominated by methoxyflavones, flavonoids that carry methoxy groups on the flavone backbone. Key compounds include 5,7-dimethoxyflavone, 5,7,4′-trimethoxyflavone and 3,5,7,3′,4′-pentamethoxyflavone. A 2018 review linked these compounds to better mitochondrial function and activation of cGMP-nitric oxide signaling, but it also warned that their low oral bioavailability may limit clinical use (Chen et al., 2018).

The supplement form is typically a standardized ethanol or ethyl acetate extract of the dried rhizome, concentrated to a specified polymethoxyflavone content. Commercial products usually deliver 100–200 mg of extract per serving.

How Does Black Ginger Work?

Several mechanisms have been proposed. Reviews link black ginger's methoxyflavones to better mitochondrial function and to cGMP-nitric oxide signaling, which relaxes blood vessels (Chen et al., 2018). Its main methoxyflavone, 5,7-dimethoxyflavone, weakly inhibits PDE5 in lab tests (Temkitthawon et al., 2011). Energy-sensing pathways such as AMPK and SIRT1 are often cited too, but that evidence comes from cell and animal studies.

AMPK (AMP-activated protein kinase) is the cell's main energy sensor. When energy runs low, it turns up fat and glucose burning and turns down fat storage. Activation of this pathway is a common hypothesis for black ginger's metabolic effects, which is why the extract is sometimes called an exercise mimetic, but that idea has not been tested directly in people.

In fat tissue, the clearest data come from mice. In high-fat-fed mice, black ginger extract lowered body weight, fat mass, fat cell size and blood glucose, triglycerides and cholesterol; it reduced fat-building gene expression and raised fat-breakdown enzymes such as carnitine palmitoyl transferase 1 and hormone-sensitive lipase (Lee et al., 2023).

Clinical Evidence: Physical Performance

Two 12-week placebo-controlled trials in young athletes give mixed but encouraging results. In soccer players, 180 mg/day improved hand grip strength but not sprint speed, leg strength, flexibility or cardiorespiratory fitness (Promthep et al., 2015). In 194 male student athletes, 360 mg/day improved grip and back-leg strength, VO2max and 50-meter sprint time, but not flexibility or the 40-yard technical test (Sripanidkulchai et al., 2022).

A 2025 network meta-analysis of dietary supplements in soccer players independently confirmed a small but significant effect of Kaempferia parviflora on muscular strength (standardized mean difference 0.46), placing it alongside caffeine and creatine as supplements with evidence for specific performance outcomes in this population (Luo et al., 2025).

The higher dose produced the broader effect. The 180 mg/day soccer trial ran six fitness tests every four weeks and found improvement only in grip strength (Promthep et al., 2015). The 360 mg/day trial also found changes in heart rate variability that its authors read as reduced stress on the autonomic nervous system (Sripanidkulchai et al., 2022).

Why it might work is still unclear. Better mitochondrial function is the usual explanation, based on laboratory data (Chen et al., 2018), but neither trial measured muscle mitochondria directly.

Single-dose studies point the same way. In healthy men, one oral dose of black ginger extract raised whole-body energy expenditure, with a peak increase of 229 kJ/day at 60 minutes, and the response was larger in men with more active brown fat (Matsushita et al., 2015). In a 2025 crossover study, a 100 mg dose had no effect, while a 200 mg dose left resting energy expenditure unchanged but lowered the respiratory exchange ratio at 2 and 3 hours, a sign of more fat burning (Evans et al., 2025).

Clinical Evidence: Fat Loss and Body Composition

Two 12-week placebo-controlled trials found less body fat. In overweight Korean adults, the SIRTMAX® extract reduced body fat, body weight and BMI, along with CT-measured total, subcutaneous and visceral fat area (Sung et al., 2025). In overweight and pre-obese Japanese adults, 150 mg/day reduced visceral, subcutaneous and total abdominal fat and lowered triglycerides (Yoshino et al., 2018).

The SIRTMAX® trial screened 108 adults and analyzed 83. Its primary endpoints were body fat mass and body fat percentage measured by DEXA. After 12 weeks, body fat, body weight and BMI fell more than with placebo, and CT scans showed similar results for total, subcutaneous and visceral fat area, although waist and hip circumference did not differ (Sung et al., 2025).

The earlier Japanese trial enrolled 76 adults with a BMI of 24 to under 30 and used CT scanning, the reference method for abdominal fat. One 150 mg capsule a day for 12 weeks reduced visceral, subcutaneous and total abdominal fat and lowered triglycerides compared with placebo, with no adverse events or abnormal lab results (Yoshino et al., 2018).

Antioxidant and Anti-Inflammatory Effects

The antioxidant and anti-inflammatory data come from laboratory and animal studies, not human trials. In skin cells and mouse skin, black ginger extract reduced UV-induced COX-2 expression through antioxidant activity (Lee et al., 2018), and in a rat arthritis model it reduced joint damage and suppressed NF-κB and MAPK signaling (Ongchai et al., 2021).

These results fit black ginger's anti-inflammatory reputation, but they do not show that a capsule changes antioxidant enzyme levels in people. No published human trial has measured that outcome.

In the rat arthritis study, the plant's three major methoxyflavones reproduced much of the extract's effect on inflammatory joint genes, suggesting these compounds drive the activity (Ongchai et al., 2021).

Dosage, Safety, and How to Take Black Ginger

Human trials have used 150 to 360 mg/day of standardized extract for 12 weeks (Yoshino et al., 2018) (Sripanidkulchai et al., 2022), and those trials reported no safety problems in blood tests. Take it with a meal; the methoxyflavones are poorly absorbed (Chen et al., 2018).

150 mg/day, the dose that reduced abdominal fat in the Japanese 12-week trial (Yoshino et al., 2018).

180 mg/day, the dose in the soccer trial, which improved grip strength (Promthep et al., 2015).

360 mg/day, the dose in the student-athlete trial, which improved strength, VO2max and sprint time (Sripanidkulchai et al., 2022).

The 12-week trials reported no adverse events linked to the extract and normal blood chemistry and blood counts (Yoshino et al., 2018) (Sripanidkulchai et al., 2022). The SIRTMAX® trial also judged its extract safe (Sung et al., 2025). Longer-term human safety data are not available.

Taking black ginger with a meal is a reasonable default. Its methoxyflavones are poorly absorbed (Chen et al., 2018), and none of the trials compared fasting with fed dosing.

Drug interactions have not been studied in people. Because the 2024 meta-analysis found lower fasting glucose (Na Takuathung et al., 2024), people on glucose-lowering drugs should monitor their blood sugar. Because the methoxyflavones inhibit PDE5 in lab tests (Temkitthawon et al., 2011), anyone taking a PDE5 inhibitor or nitrates should ask their doctor first.

Black Ginger for Men: Sexual Health and Testosterone

The human evidence is small. In an open-label pilot study, 13 healthy men aged 50 to 68 with mild erectile dysfunction took 100 mg/day for 30 days and reported better erectile function and intercourse satisfaction (Stein et al., 2018). A 2024 meta-analysis of animal and human studies also found improved sexual function (Na Takuathung et al., 2024). In lab tests, the plant's methoxyflavones are weak PDE5 inhibitors (Temkitthawon et al., 2011).

In Thai folk medicine, krachai dum is best known as a male vitality tonic. Research has only started to test that reputation, and most of it is laboratory work.

The leading mechanism is PDE5 inhibition. PDE5 breaks down cyclic GMP, a signaling molecule that relaxes smooth muscle in blood vessels. In a screen of 41 plant extracts, black ginger was one of four that inhibited PDE5, and its strongest compound, 5,7-dimethoxyflavone, had an IC50 of about 10.6 µM, making it a low-affinity inhibitor (Temkitthawon et al., 2011).

The Stein study had no placebo group, so expectation effects cannot be ruled out, and the authors noted the effects were smaller than those of prescription medication (Stein et al., 2018). A placebo-controlled trial is needed before firm claims can be made.

Black ginger is not a substitute for medical treatment of erectile dysfunction. Men experiencing persistent sexual health concerns should consult a healthcare provider rather than relying on botanical supplements. As a traditional tonic with some mechanistic support, black ginger is a reasonable addition to a broader health optimization strategy.

If you decide to try it, pair the supplement with regular exercise rather than using it as a substitute. The 360 mg/day student-athlete trial found improvements in VO2max and heart rate variability alongside training (Sripanidkulchai et al., 2022), but there was no exercise-only comparison, so how much came from the supplement versus the training itself is unknown. An active lifestyle is the one intervention with unambiguous evidence for the outcomes black ginger targets: body composition, cardiovascular fitness and metabolic health.

Black Ginger and Cognitive Function

All of the cognitive data are preclinical. In a 2025 study, black ginger extract and its methoxyflavones inhibited cholinesterase enzymes, blocked amyloid-beta clumping and protected nerve cells in lab tests, and the extract improved memory in mice given scopolamine (Takomthong et al., 2025). No human cognitive trial has been published.

The 2025 PLOS ONE study measured five methoxyflavones. 5,7-dimethoxyflavone was the most abundant, while 5,7,4′-trimethoxyflavone combined anti-cholinesterase and anti-amyloid activity and looked like the most promising multi-target compound. The extract also reversed scopolamine-induced memory deficits in mice (Takomthong et al., 2025).

While the preclinical cognitive data is promising, no human clinical trial has specifically evaluated black ginger for cognitive outcomes. The exercise performance and metabolic trials provide indirect support, improved cardiovascular fitness and metabolic health generally correlate with better cognitive function — but direct evidence from cognitive-focused human studies is needed. This represents a significant research gap given the strength of the preclinical signals.

Black Ginger vs. Regular Ginger vs. Turmeric

Black ginger, common ginger and turmeric share a plant family but not their active compounds. Black ginger's methoxyflavones are studied mainly for body fat and physical performance, common ginger's gingerols mainly for nausea and inflammation, and turmeric's curcumin mainly for inflammation. All three are poorly absorbed in their plain forms.

Black ginger (Kaempferia parviflora): active compounds are methoxyflavones. Proposed mechanisms include mitochondrial support, cGMP-nitric oxide signaling and weak PDE5 inhibition. Best human evidence: body fat reduction and some strength measures. Oral bioavailability: low (Chen et al., 2018).

Regular ginger (Zingiber officinale), active compounds are gingerols and shogaols. Primary mechanisms: serotonin receptor antagonism (anti-nausea), COX-2 inhibition (anti-inflammatory), thermogenic effects. Best evidence for: nausea (pregnancy, chemotherapy, motion sickness), osteoarthritis pain, digestive support. Bioavailability: moderate; heating converts gingerols to shogaols with different potency.

Turmeric (Curcuma longa), active compound is curcumin. Primary mechanisms: NF-κB suppression, COX-2 inhibition, Nrf2 activation. Best evidence for: inflammatory conditions (arthritis, IBD), pain management, oxidative stress reduction. Bioavailability: notoriously poor; requires piperine or lipid formulation for meaningful absorption.

The three botanicals are complementary rather than competitive. A person taking black ginger for metabolic and performance benefits could reasonably also use ginger for digestive health and turmeric for anti-inflammatory support. The active compound classes (PMFs, gingerols, curcuminoids) are structurally distinct and operate through largely non-overlapping mechanisms, so no significant interactions between them are expected at standard supplement doses.

Choosing a Black Ginger Supplement

Look for an extract that states its methoxyflavone content, ideally one with published human data such as the SIRTMAX® extract used in the 2025 Korean trial (Sung et al., 2025). Plain rhizome powder with no standardization gives no assurance of how much active compound you are getting.

One challenge with black ginger is bioavailability. A 2013 pharmaceutical study found that the plant's main methoxyflavones, including 5,7-dimethoxyflavone, have low oral bioavailability in their plain form, and tested self-emulsifying delivery systems and nanocapsules to improve absorption (Mekjaruskul et al., 2013). Consumers cannot easily verify which delivery technology a product uses, but the clinical trials that showed benefits used concentrated ethanol or ethyl acetate extracts, not plain rhizome powder, so choosing a standardized extract already puts you ahead of the absorption curve. Taking the capsule with a meal that contains some fat is the simplest practical step to support absorption of these lipophilic compounds (Chen et al., 2018).

When evaluating black ginger supplements, several quality markers distinguish clinical-grade products from commodity ingredients:

Standardization: the most important label detail. A label that lists only "Kaempferia parviflora extract 150 mg" without methoxyflavone content does not tell you whether the active compounds are present at the levels used in trials.

Extraction method: the human trials used concentrated extracts rather than plain rhizome powder, so a simple tea may not match their results.

Third-party testing, as with any supplement, look for products tested by independent laboratories for identity, potency, heavy metals, and microbial contamination. NSF International, USP, and ConsumerLab certifications provide additional assurance.

Dose per serving: check that the product supplies 150 to 360 mg of extract per day, the range used in the human trials, and avoid proprietary blends that hide the black ginger dose.

Black Ginger and Cardiovascular Health

There are no cardiovascular outcome trials. The relevant human data are metabolic: lower triglycerides in the Japanese 12-week trial (Yoshino et al., 2018) and lower fasting glucose in a 2024 meta-analysis (Na Takuathung et al., 2024). Laboratory work adds possible vascular effects through cGMP-nitric oxide signaling and weak PDE5 inhibition (Chen et al., 2018).

Triglycerides fell with 150 mg/day for 12 weeks in overweight Japanese adults (Yoshino et al., 2018). Across animal and human studies, the 2024 meta-analysis found lower fasting blood glucose, with a standardized mean difference of −0.51 in the human studies (Na Takuathung et al., 2024). Both are recognized cardiovascular risk factors, but no trial has measured heart attacks or strokes.

PDE5 is also present in blood vessel walls, and prescription PDE5 inhibitors are used for some lung and heart conditions. Black ginger's methoxyflavones are low-affinity PDE5 inhibitors (Temkitthawon et al., 2011), so any vascular effect in people is speculative.

Black Ginger and Anti-Aging: The SIRT1 Connection

SIRT1 is a longevity-linked enzyme, and the brand name SIRTMAX® reflects interest in this pathway. Evidence that black ginger activates SIRT1 comes from laboratory work, and no human study has measured aging markers such as epigenetic clocks after black ginger.

The anti-aging implications of black ginger are derived from mechanistic reasoning and extrapolation from the metabolic and performance trial data rather than from direct longevity studies in humans. No clinical trial has measured aging biomarkers (epigenetic clocks, telomere length, senescent cell markers) in response to black ginger supplementation. The compound is promising in the longevity context, but the evidence base is at the "mechanistically compelling, clinically unconfirmed" stage for anti-aging claims specifically.

What is black ginger good for?

The strongest human evidence is for body fat reduction: two 12-week placebo-controlled trials found less abdominal or total body fat (Yoshino et al., 2018) (Sung et al., 2025). Two trials in athletes found gains in some strength measures, and one found higher VO2max at 360 mg/day (Sripanidkulchai et al., 2022).

Is black ginger the same as regular ginger?

No. Black ginger (Kaempferia parviflora) is a different species from common ginger (Zingiber officinale). While both belong to the Zingiberaceae family, they have different active compounds and different clinical applications. Common ginger is rich in gingerols and shogaols and is primarily studied for nausea and anti-inflammatory effects. Black ginger is rich in polymethoxyflavones and is studied for metabolic, performance, and body composition benefits.

How long does black ginger take to work?

A single dose raised energy expenditure within an hour in one study (Matsushita et al., 2015) and shifted fuel use toward fat at two to three hours in another (Evans et al., 2025). Body composition and fitness changes were measured after 12 weeks of daily use.

Is black ginger safe?

Trials at 150 to 360 mg/day for 12 weeks reported no adverse events linked to the extract and normal blood tests (Yoshino et al., 2018) (Sripanidkulchai et al., 2022). Long-term safety data are lacking. People taking glucose-lowering drugs, PDE5 inhibitors or nitrates should check with their doctor first.