According to Gram Research analysis of a 2026 Uganda study of 246 women, over half (54%) had vitamin D deficiency, but low vitamin D wasn’t statistically linked to having uterine fibroids. However, women with multiple fibroids showed slightly lower vitamin D levels, suggesting a weak possible connection that requires further investigation.
Researchers in Uganda studied whether low vitamin D levels are connected to uterine fibroids (benign growths in the uterus) in women of childbearing age. They tested 246 women and found that over half had vitamin D deficiency, but surprisingly, vitamin D levels weren’t directly linked to having fibroids. However, women with more fibroids did tend to have slightly lower vitamin D. The findings suggest vitamin D deficiency is common and worth addressing, though the connection to fibroids needs more research.
Key Statistics
A 2026 cross-sectional study of 246 women in Uganda found that 54.1% had vitamin D deficiency, highlighting a significant public health concern in the region.
Among 246 Ugandan women studied in 2026, vitamin D deficiency showed no statistically significant association with uterine fibroids (p = 0.478), though women with multiple fibroids had slightly lower vitamin D levels.
A 2026 Uganda study of 246 women revealed a weak negative correlation between vitamin D levels and the number of fibroids present (r = -0.2482, p = 0.0342), suggesting vitamin D may play a minor role in fibroid multiplicity.
The Quick Take
- What they studied: Whether women with low vitamin D levels are more likely to have uterine fibroids (non-cancerous growths in the uterus)
- Who participated: 246 non-pregnant women of childbearing age from three hospitals in Uganda. Researchers measured their vitamin D levels and used ultrasound to check for fibroids.
- Key finding: Over half the women (54%) had low vitamin D, but low vitamin D wasn’t statistically linked to having fibroids. However, women with multiple fibroids had slightly lower vitamin D levels overall.
- What it means for you: While this study didn’t prove vitamin D deficiency causes fibroids, the high rate of vitamin D deficiency in the population suggests getting enough vitamin D is important for overall health. If you have fibroids or are at risk, discuss vitamin D levels with your doctor, but don’t expect it to be a complete solution.
The Research Details
This was a cross-sectional study, which means researchers took a snapshot in time rather than following women over months or years. Between October 2022 and January 2023, researchers at three hospitals in Uganda recruited 246 women and collected information about their health using questionnaires. They then took blood samples to measure vitamin D levels and performed ultrasound scans to look for fibroids in the uterus.
The researchers compared vitamin D levels between women who had fibroids and those who didn’t. They used statistical tests to see if there was a meaningful connection between low vitamin D and the presence of fibroids. They also looked at whether vitamin D levels related to how many fibroids women had.
Cross-sectional studies are useful for identifying patterns and connections in a population at one point in time. This approach was practical for Uganda because it allowed researchers to quickly gather information from multiple hospitals. However, this study design can’t prove that low vitamin D causes fibroids—it can only show whether they occur together more often than expected.
The study was conducted at multiple hospitals, which strengthens the findings by including women from different areas. The researchers used objective measurements (blood tests and ultrasound) rather than relying only on what women reported. However, the study only included women in Uganda, so results may not apply to other populations. The sample size of 246 is moderate—larger studies might reveal patterns this one missed.
What the Results Show
The study found that vitamin D deficiency was very common, affecting 54.1% of the women studied. This is important because it shows a public health problem in Uganda that deserves attention.
However, when researchers compared vitamin D levels between women with and without fibroids, they found no statistically significant difference. In other words, having low vitamin D wasn’t clearly linked to having fibroids. The average vitamin D level was slightly lower in women with fibroids (19.95 units) compared to women without fibroids (21.55 units), but this small difference could easily have happened by chance.
Interestingly, there was one meaningful finding: women who had multiple fibroids (more than one) tended to have lower vitamin D levels than women with fewer fibroids. This weak connection was statistically significant, meaning it probably wasn’t due to chance alone.
The high prevalence of vitamin D deficiency (54%) is itself an important finding that suggests many women in Uganda may benefit from vitamin D screening and supplementation for general health reasons, even if it doesn’t directly prevent fibroids. The weak correlation between vitamin D levels and the number of fibroids suggests that vitamin D might play a small role in fibroid development or growth, but the connection is not strong enough to be clinically useful.
Previous research in other populations has suggested a possible link between vitamin D deficiency and fibroids, which is why researchers wanted to test this in Uganda. This study’s finding of no strong connection differs from some earlier research, suggesting that the vitamin D-fibroid relationship may vary by population or that other factors are more important. The high rate of vitamin D deficiency in Uganda aligns with findings from other African countries.
This study has several important limitations. First, it only included women at three hospitals, so results may not represent all Ugandan women. Second, the study was conducted at one point in time, so researchers couldn’t determine whether low vitamin D came before fibroids developed or after. Third, the study didn’t account for other factors that might influence both vitamin D levels and fibroids, such as diet, sun exposure, or genetics. Finally, 246 women is a moderate sample size—a larger study might find connections this one missed.
The Bottom Line
Based on this research, vitamin D deficiency should be addressed as a public health concern in Uganda through education and possible supplementation programs. However, vitamin D supplementation should not be considered a primary treatment or prevention strategy for fibroids at this time. Women with fibroids should discuss vitamin D status with their healthcare provider as part of overall health management, but maintain realistic expectations about its role in fibroid treatment.
Women of childbearing age in Uganda and other African populations should care about this research because it highlights the high prevalence of vitamin D deficiency in their region. Women with fibroids may find this information relevant but shouldn’t rely solely on vitamin D for fibroid management. Healthcare providers in Uganda should consider vitamin D screening and education as part of women’s health programs.
If vitamin D deficiency is addressed through supplementation, it typically takes 2-3 months to normalize vitamin D levels with consistent supplementation. However, this study suggests that correcting vitamin D deficiency alone won’t quickly resolve existing fibroids. Long-term benefits for overall health may take several months to a year of adequate vitamin D status.
Frequently Asked Questions
Does low vitamin D cause uterine fibroids?
This Uganda study of 246 women found no clear statistical link between vitamin D deficiency and having fibroids. However, women with multiple fibroids had slightly lower vitamin D, suggesting a possible weak connection that needs more research.
How common is vitamin D deficiency in African women?
This 2026 study found 54% of Ugandan women had vitamin D deficiency, indicating it’s a widespread public health issue. Researchers recommend health education and screening programs to address this common problem.
Can taking vitamin D supplements help treat fibroids?
This study doesn’t support vitamin D supplementation as a primary fibroid treatment. While vitamin D is important for overall health, the research shows no strong connection between vitamin D levels and fibroid presence, so it shouldn’t replace proven fibroid treatments.
Should women with fibroids get their vitamin D levels checked?
Yes, vitamin D screening is reasonable as part of overall health management, especially in populations with high deficiency rates like Uganda. However, correcting vitamin D deficiency alone is unlikely to resolve existing fibroids based on current evidence.
Why is vitamin D deficiency so common in Uganda?
While this study documents the high prevalence (54%), it doesn’t explain the causes. Factors may include limited sun exposure, dietary patterns, or skin pigmentation affecting vitamin D production. Further research is needed to understand regional causes.
Want to Apply This Research?
- Track weekly vitamin D intake (through sunlight exposure, food, or supplements) and monthly vitamin D blood test results if available. Record any changes in fibroid-related symptoms like heavy bleeding or pelvic pain to see if vitamin D supplementation correlates with symptom changes over 3-6 months.
- Users can set a daily reminder to take a vitamin D supplement (if recommended by their doctor), log sun exposure time, and track vitamin D-rich foods consumed. Create a simple weekly checklist: supplement taken, sun exposure (15-30 minutes), and vitamin D food sources consumed.
- Establish a baseline vitamin D level through blood work, then retest every 3 months while supplementing. Track fibroid-related symptoms monthly using a simple pain/bleeding scale. After 6 months, review whether vitamin D normalization correlated with any symptom improvement, and share results with healthcare provider.
This research summary is for educational purposes only and should not replace professional medical advice. The study found no definitive link between vitamin D deficiency and fibroids, so vitamin D supplementation should not be considered a primary treatment for uterine fibroids. Women with fibroids or concerns about vitamin D levels should consult with their healthcare provider for personalized evaluation and treatment recommendations. This study was conducted in Uganda and may not apply to all populations. Always discuss any supplements or health interventions with your doctor before starting.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.