According to research reviewed by Gram, taking Korean red ginseng for 6 months did not shrink or slow uterine fibroids in premenopausal women. In a 2026 randomized trial of 69 women, fibroid size changed by a similar amount in the ginseng and placebo groups, and hormone levels did not differ.
Many women take supplements hoping to ease uterine fibroids, the common noncancerous growths in the uterus. According to research reviewed by Gram, a 6-month trial tested whether Korean red ginseng could slow fibroid growth. The study included 69 premenopausal women with fibroids, and half took daily ginseng while the other half took a placebo, a pill with no active ingredient. Fibroids grew a little in both groups, and the ginseng did not make a meaningful difference. Blood tests and reproductive hormone levels also looked similar in both groups. The researchers could not fully confirm that ginseng is safe, because they relied on participants reporting side effects on their own. Women with fibroids should talk with their doctor before starting any supplement.
Key Statistics
A 2026 randomized placebo-controlled trial of 69 premenopausal women found that 6 months of Korean red ginseng did not meaningfully change uterine fibroid growth compared with placebo.
In that trial, fibroids in the ginseng group grew about 0.11 centimeters less than in the placebo group, a difference that was not statistically significant (95% confidence interval: -0.33 to 0.12 centimeters).
Of the 69 women randomized in the 2026 Korean red ginseng trial, 61 completed the full 6-month assessment, and no treatment-related serious adverse events were recorded.
The Quick Take
- What they studied: Researchers asked whether taking Korean red ginseng, a popular herbal supplement, could stop uterine fibroids from growing or change hormone levels in women who were not yet going through menopause.
- Who participated: The study included 69 women aged 20 to 45 who had one fibroid between 1 and 8 centimeters wide. None were having surgery or other treatment for it. Participants were assigned by chance to ginseng or a placebo pill, and 61 finished the full 6 months.
- Key finding: Fibroids grew slightly in both groups, and the ginseng group grew about 0.11 centimeters less on average. This small difference was not statistically significant, meaning it could easily have happened by chance. Blood counts and hormone levels also did not differ between groups.
- What it means for you: Based on this trial, red ginseng does not appear to shrink or slow fibroids over 6 months. Because the study was small and side effects were tracked loosely, it does not prove the supplement is safe. If you have fibroids, check with your doctor before taking any herbal product.
The Research Details
This was a randomized controlled trial, which means participants were placed into groups by chance, much like flipping a coin. Half took Korean red ginseng at 3 grams per day, and half took an identical-looking placebo. The study ran for 6 months at one medical center in Korea, and it was double-blind, so neither the participants nor the researchers knew who received which pill.
The main measure was how much each participant’s largest fibroid changed in size, checked by ultrasound scans. Researchers also tested blood counts, iron levels (ferritin), liver enzymes, and reproductive hormones. Expert ultrasound readers and data analysts did not know which group each woman belonged to, which helps prevent bias.
The trial enrolled participants between 2015 and 2019. Because the trial was carefully designed, its results are easier to trust than those from observational studies that only watch what people choose to do.
Randomizing participants and using a placebo makes it possible to separate the real effect of ginseng from other factors, such as the natural changes that fibroids go through over time. Blinding everyone involved keeps expectations from influencing the results. These design features make the finding of no meaningful effect more reliable than it would be from a simple before-and-after comparison.
The trial had strong design features, including random assignment, a placebo group, and blinding of participants, staff, and analysts. Its main limitation is size: only 69 women enrolled, and 8 dropped out, so the trial had limited power to detect small effects. Side effects were collected passively, meaning participants had to report them on their own, so mild problems may have been missed. The researchers also noted that the ginseng product was not fully characterized in the report.
What the Results Show
Fibroids grew modestly in both groups over the 6 months. The average difference between the ginseng and placebo groups was 0.11 centimeters, with the ginseng group showing slightly less growth. However, the range of possible true differences, from a 0.33 centimeter decrease to a 0.12 centimeter increase, included zero, so the result could be due to chance. The researchers had set a target difference of 0.33 centimeters that would count as meaningful, and the upper end of the range stayed below that target.
The researchers also compared routine blood tests, including blood cell counts, iron stores, and liver enzymes. None of these measures changed differently between the two groups in a way that reached statistical significance.
Hormone levels were similar as well. When the researchers looked at all the reproductive hormones together, the overall pattern did not differ between groups. In a set of extra, exploratory analyses, the way hormone changes related to one another also looked similar in both groups.
No serious side effects linked to the ginseng were recorded, and no participant stopped taking it because of intolerance. However, side effects were gathered only when participants reported them, so the absence of reports does not guarantee that ginseng is free of side effects. Milder problems, such as stomach upset or sleep changes, may not have been captured. The researchers were clear that their findings do not establish safety.
Most of the evidence for herbal and dietary approaches to fibroids comes from small studies, lab work, or animal research, and none has shown strong effects in people. This trial adds rigorous, placebo-controlled evidence that red ginseng does not appear to shrink fibroids within 6 months. It fits with the broader pattern that many supplements marketed for women’s reproductive health have limited proof behind them.
The trial enrolled only 69 women at one center in Korea, so the results may not apply to women elsewhere or with different fibroid types. The study lasted only 6 months, so it cannot show effects over years. Eight women dropped out, and the product itself was not described in full detail. Safety information was collected passively, which means side effects may have been underreported. The researchers also ran some extra analyses after the main study, which should be treated as exploratory rather than conclusive.
The Bottom Line
Based on this trial, there is moderate confidence that 6 months of Korean red ginseng at 3 grams per day does not meaningfully slow or shrink uterine fibroids in premenopausal women. There is low confidence about long-term effects and about how safe the supplement is, since the study was small and side effects were gathered passively. Women should not rely on ginseng as a treatment for fibroids based on this trial.
This research is most relevant to premenopausal women with small to medium uterine fibroids who are considering red ginseng or who are monitoring their fibroids without surgery. It is also useful for anyone who has heard claims that ginseng can shrink fibroids. Women who are pregnant, planning pregnancy, taking blood thinners or other medications, or who have a bleeding disorder should speak with a doctor before taking any supplement. Women who have been advised to have fibroid treatment should not delay it based on these findings.
This trial tracked changes over 6 months, so that is the timeframe the results cover. Fibroids normally change slowly, and the study found no meaningful difference within that window. Any effect that takes longer than 6 months to appear would not have been detected. Anyone who wants to try a supplement should expect to wait several months and should keep regular check-ups with their doctor during that time.
Frequently Asked Questions
Does red ginseng shrink uterine fibroids?
Research shows red ginseng did not meaningfully shrink uterine fibroids over 6 months. In a 2026 randomized trial of 69 women, fibroid growth was similar in the ginseng and placebo groups, and the difference was not statistically significant.
Is Korean red ginseng safe to take if I have fibroids?
The trial found no serious side effects linked to ginseng, but it could not confirm safety. Side effects were reported by participants on their own, and the study was small and short. Talk with your doctor before starting any supplement.
How long did the red ginseng fibroid study last?
The study lasted 6 months and enrolled women aged 20 to 45 with fibroids measuring 1 to 8 centimeters. Participants took 3 grams of ginseng or placebo daily. Enrollment ran from December 2015 to September 2019 at one center in Korea.
Can supplements like ginseng replace treatment for uterine fibroids?
This trial does not support using ginseng as a fibroid treatment, since it showed no meaningful effect on fibroid size. Women with symptomatic fibroids should discuss proven options with a doctor, who can monitor growth with ultrasound.
Want to Apply This Research?
- Log your daily supplement intake, including the exact product, dose, and time taken. Record any symptoms you notice each day on a simple 1 to 5 scale, such as pelvic pressure, heavy bleeding, or pain. Ask your doctor about scheduling an ultrasound at 3 and 6 months to measure fibroid size and compare it with your baseline.
- Set a daily reminder to take your supplement at the same time, and pair it with a habit you already have, such as breakfast. Use the app to note any new side effects right away so you can share them with your doctor. Consider writing down questions for your next appointment so you do not forget them.
- Track symptoms, supplement use, and any medications every week, and review trends each month. Schedule follow-up ultrasounds and blood tests with your healthcare provider every 3 to 6 months, and upload results to the app so changes are visible over time. If you stop or change the supplement, record the date so you can compare symptoms before and after.
This article summarizes one small clinical trial and is for general education only. It is not medical advice. Uterine fibroids can cause symptoms that need professional care, and supplements can interact with medications or affect pregnancy. Please consult a qualified healthcare provider before starting, stopping, or changing any supplement or treatment.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.