Panax Ginseng: What It Actually Does for Blood Sugar and Endurance

A look at how this classic root affects fasting glucose and exercise capacity, according to the human trials and animal studies we have.

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By the Ration Editorial Team · Reviewed against primary research · Updated July 14, 2026

Panax ginseng, often called Korean or Asian ginseng, is a root used for centuries in traditional medicine.

Modern research has focused on two specific groups of compounds in the root: ginsenosides and ginseng polysaccharides.

These compounds are thought to influence glucose metabolism, mitochondrial function, and possibly the gut microbiota^[5].

This is where the evidence is strongest. Several randomized controlled trials in people with impaired fasting glucose or type 2 diabetes have tested Korean red ginseng or fermented red ginseng extracts.

A 2014 trial found that Korean red ginseng improved glucose control in people with impaired fasting glucose, impaired glucose tolerance, or newly diagnosed type 2 diabetes^[9].

A separate trial using fermented red ginseng reported improvements in postprandial glucose, the blood sugar spike after a meal, in a similar population^[10].

Another RCT combined red ginseng with cheonggukjang, a fermented soybean food, and found improvements in both fasting glucose and lipid profile^[11].

More recently, ginseng berry saponins, a different extract than the root itself, improved glucose metabolism in a crossover trial of adults with prediabetes^[3].

Animal studies back this up mechanistically. Korean red ginseng extract reduced both fasting and after meal blood sugar in diabetic mice^[4], and a 2025 study used network pharmacology and single cell sequencing to map out how ginseng compounds may act on pathways involved in diabetic complications like retinopathy^[1].

Taken together, this is a reasonably consistent body of human and animal evidence, which is why fasting glucose earns a grade A consensus for a decrease in our database.

• ↑VO2maxAHuman trials

  Research may raise VO2max · strong agreement · 6 studies

  View 5 studies on PubMed

  • Short-Term Panax Ginseng Extract Supplementation Reduces Fasting Blood Triacylglycerides and Oxygen Consumption during Sub-Maximal Aerobic Exercise in Male Recreational Athletes (2024)
  • Anti-Fatigue Effects of Small Molecule Oligopeptides Isolated from Panax ginseng C. A. Meyer in Mice (2016)
  • Ginseng ameliorates exercise-induced fatigue potentially by regulating the gut microbiota (2021)
  • Changbai Mountain Ginseng (Panax ginseng C.A. Mey) Extract Supplementation Improves Exercise Performance and Energy Utilization and Decreases Fatigue-Associated Parameters in Mice (2017)
  • Effects of Antrodia camphorata and Panax ginseng supplementation on anti-fatigue properties in mice (2018)
• ↓Fasting GlucoseAHuman trials

  Research may lower Fasting Glucose · strong agreement · 6 studies

  View 5 studies on PubMed

  • Postprandial glucose-lowering effects of fermented red ginseng in subjects with impaired fasting glucose or type 2 diabetes: a randomized, double-blind, placebo-controlled clinical trial (2014)
  • Supplementation of cheonggukjang and red ginseng cheonggukjang can improve plasma lipid profile and fasting blood glucose concentration in subjects with impaired fasting glucose (2011)
  • Korean red ginseng improves glucose control in subjects with impaired fasting glucose, impaired glucose tolerance, or newly diagnosed type 2 diabetes mellitus (2014)
  • Effects of ginseng berry saponins from panax ginseng on glucose metabolism of patients with prediabetes: A randomized, double-blinded, placebo-controlled, crossover trial (2024)
  • Mechanistic Insights into Shenzhuo Formula for Diabetic Retinopathy: Integrating UPLC-Q-TOF-MS/MS, Network Pharmacology, Single-Cell RNA Sequencing Data, and Experimental Validation (2025)

The second major area of research is exercise capacity, measured largely through VO2max and oxygen consumption during exertion.

A 2024 randomized trial in male recreational athletes found that short-term Panax ginseng extract supplementation reduced fasting triacylglycerides and lowered oxygen consumption during submaximal aerobic exercise^[2].

Lower oxygen consumption at a given workload generally signals improved exercise efficiency, meaning the body is doing the same work for less metabolic cost.

Much of the supporting evidence for ginseng's effects on fatigue and endurance comes from animal studies rather than large human trials.

• Ginseng polysaccharides extended swim time to exhaustion and reduced fatigue markers like blood lactate in mice^[12]
• Small oligopeptides isolated from ginseng showed anti-fatigue effects in mouse exercise models^[8]
• Changbai Mountain ginseng extract improved exercise performance and energy utilization while reducing fatigue-related markers in mice^[7]
• Combining ginseng with Antrodia camphorata produced anti-fatigue effects in mice^[6]
• Ginseng supplementation altered gut microbiota composition in a way linked to reduced exercise-induced fatigue^[5]

These findings are consistent enough across different mouse models and ginseng preparations that a grade A consensus for increased VO2max shows up in our data, though it is worth remembering that most of this specific mechanistic work is preclinical.

For glucose metabolism, ginsenosides appear to influence insulin signaling pathways and pancreatic function, based on network pharmacology and cell-level analyses^[1][4].

For fatigue and exercise, the proposed mechanisms include better mitochondrial energy production, reduced lactate accumulation, and changes to gut bacteria that may affect how the body handles metabolic byproducts of exercise^[5][12].

None of these mechanisms are fully settled in humans, and most detailed pathway work has been done in animals or in silico rather than in people.

• Korean red ginseng, the steamed and dried root, used in most of the human glucose trials^[9][10][11]
• Ginseng berry extract, a less common form studied specifically for prediabetes^[3]
• Fermented red ginseng, processed with microbes to potentially increase certain ginsenosides^[10]
• Ginseng polysaccharide extracts, studied mainly for fatigue in animal models^[12]
• Root powder or capsules, the most common consumer supplement form

Doses varied considerably across trials, with some human studies using several grams of red ginseng extract daily over a period of weeks to months^[9][11].

The exercise trial used a shorter supplementation window, just days to weeks, before measuring effects on submaximal exercise^[2].

Because dosing protocols differ so much between studies and extract types, no single standardized human dose has been firmly established.

Ginseng is generally well tolerated in the trials reviewed here, which mostly reported on blood glucose, lipids, and exercise measures rather than significant adverse events.

Because ginseng may lower blood sugar, anyone managing diabetes or using glucose-lowering medications should be mindful that combining them could have additive effects^[9][10].

People taking blood thinners or stimulant-sensitive medications are often advised to be cautious with ginseng, given its long history of interactions noted in traditional and pharmacological literature.

This article is not medical advice, and anyone with diabetes, cardiovascular conditions, or who is pregnant should talk with a clinician before adding a supplement like this.

• Adults with prediabetes or impaired fasting glucose, based on several supportive RCTs^{[9][10][11][3]}
• Recreational athletes curious about exercise efficiency, though evidence here is preliminary and short-term^[2]
• People interested in fatigue reduction, keeping in mind most supporting data is from animal models^{[5][6][7][8][12]}

Panax ginseng has some of the more consistent human trial support among popular herbal supplements, particularly for fasting glucose in people with prediabetes or early type 2 diabetes^{[9][10][11][3]}.

Its effects on exercise performance and VO2max are promising in animal research and supported by at least one human trial showing improved exercise efficiency^[2], but this area still leans heavily on preclinical work.

As with most supplements, ginseng looks like a modest tool rather than a dramatic fix, best considered alongside diet, exercise, and medical guidance rather than in place of them.