Several treatments can shrink uterine fibroids by 50% or more, depending on the approach. The most effective options work by cutting off the hormones that fuel fibroid growth or by destroying the fibroid’s blood supply. Some women also experience natural shrinkage after menopause, when estrogen and progesterone levels drop on their own.
How Hormones Drive Fibroid Growth
Fibroids depend on estrogen and progesterone to grow. Any treatment that lowers these hormones or blocks their action at the fibroid can cause it to shrink. This is why fibroids tend to grow during reproductive years, may enlarge during pregnancy, and stabilize or regress after menopause. About 20% of women see their fibroids shrink on their own without any treatment, and menopause remains the most common reason fibroids naturally regress.
Medications That Shrink Fibroids
GnRH Agonists
These are among the most powerful fibroid-shrinking drugs available. They work by shutting down ovarian hormone production, creating a temporary menopause-like state. The result is roughly a 50% reduction in fibroid volume, typically achieved within three to six months. GnRH agonists also have a direct effect on fibroid tissue itself, slowing cell growth and pulling water out of fibroid cells, which contributes to the dramatic size reduction.
The catch: they’re only recommended for up to six months because of side effects like bone loss and hot flashes. Most doctors use them as a bridge, shrinking fibroids before surgery or fertility treatment. The shrinkage effect persists for three to four months after stopping, but fibroids typically regrow once the medication is discontinued.
Oral GnRH Antagonists
Newer oral medications, such as relugolix combination therapy, take a different approach. They partially suppress hormones while adding back small amounts of estrogen and progestin to limit side effects like bone thinning. In clinical trials published in the New England Journal of Medicine, relugolix combination therapy significantly reduced heavy menstrual bleeding, pain, and uterine volume. However, it did not produce a significant reduction in the volume of the largest fibroid compared to placebo. These medications are better understood as symptom managers than fibroid shrinkers, though the overall uterine size does decrease.
Selective Progesterone Receptor Modulators
This class of medication blocks progesterone’s action directly at the fibroid. In clinical studies, the shrinkage was substantial and improved with repeated treatment courses: about 50% volume reduction after one course, climbing to over 72% after four courses. Unlike GnRH agonists, these drugs can be given in intermittent cycles, which helps manage side effects. They work by stopping fibroid cell proliferation and affecting blood flow to the uterus. Availability varies by country, and liver safety monitoring may be required during treatment.
Hormonal IUDs
A progestin-releasing IUD is sometimes recommended for fibroid symptoms, but the evidence on actual shrinkage is mixed. Multiple studies confirm it dramatically reduces heavy menstrual bleeding and improves anemia. Some research has found decreases in fibroid volume, particularly between six and twelve months of use, while other studies found no significant size change at all. One three-year study showed the overall uterine volume dropped significantly, but the fibroid itself stayed the same size. If your main concern is heavy periods rather than fibroid bulk, a hormonal IUD can be very effective. If you need the fibroid itself to get smaller, other options are more reliable.
Procedures That Shrink Fibroids
Uterine Artery Embolization
This minimally invasive procedure works by blocking the blood vessels that feed the fibroid. A radiologist threads a thin catheter through a small incision in your groin or wrist and injects tiny particles into the uterine arteries. Starved of blood, the fibroid shrinks. In a large cohort study, the average fibroid volume reduction was about 58%, with most patients seeing 40% to 60% shrinkage by six months. After 12 months, roughly 68% of patients achieved greater than 50% volume reduction. Recovery typically takes one to two weeks, and the fibroid does not regrow because the tissue has been permanently deprived of its blood supply.
MRI-Guided Focused Ultrasound
This completely noninvasive procedure uses focused sound waves to heat and destroy fibroid tissue while you lie inside an MRI scanner. There’s no incision at all. Typical volume reductions range from about 34% to 49% at 12 months, though individual results can be more dramatic. The procedure works best on fibroids that can be clearly targeted by the ultrasound beam, and not all fibroids are good candidates based on their location or composition. Recovery is fast, often just a day or two.
Nutritional Factors Linked to Fibroid Size
Green Tea Extract
An NIH-funded clinical trial tested 800 mg of decaffeinated green tea extract daily in women with symptomatic fibroids. After four months, women taking the supplement saw a 32.6% reduction in total fibroid volume and a similar improvement in symptom severity, both statistically significant compared to placebo. The active compound interferes with fibroid cell growth and promotes cell death. This is one of the few dietary supplements with actual clinical trial data behind it for fibroids, though the study was small (39 women) and larger trials are needed to confirm the results.
Vitamin D
Vitamin D doesn’t appear to shrink existing fibroids, but adequate levels may slow their growth. A prospective ultrasound study found that women with vitamin D levels at or above 20 ng/mL had about 10% less fibroid growth per 18-month period compared to women with levels below that threshold. Vitamin D deficiency is common, particularly among Black women, who also have the highest rates of fibroids. Getting your levels checked and supplementing if you’re deficient is a reasonable step, though it’s unlikely to replace other treatments for fibroids that are already causing problems.
Does Weight Loss Shrink Fibroids?
The relationship between body weight and fibroids is more complicated than you might expect. A large prospective study found that women with a BMI of 30 to 35 had a slightly higher rate of developing new fibroids compared to normal-weight women. But when researchers looked at the growth rate of existing fibroids, higher BMI was actually associated with slightly slower growth, not faster. The differences were small (around 2% to 10% less growth) and not statistically definitive.
Excess body fat does produce estrogen, which theoretically could fuel fibroid growth. But the study data suggests this effect is modest at best, and losing weight has not been shown to meaningfully shrink fibroids that are already established. Weight loss has many other health benefits, but if you’re looking to reduce fibroid size specifically, the treatments above are more direct options.
Comparing Your Options
- GnRH agonists: ~50% volume reduction in 3 to 6 months, but temporary and limited to short-term use
- Progesterone receptor modulators: 50% to 72% reduction over multiple treatment courses, with longer-lasting effects
- Uterine artery embolization: ~58% reduction, permanent, minimally invasive
- Focused ultrasound: 34% to 49% reduction, completely noninvasive, fast recovery
- Green tea extract: ~33% reduction in a small trial, low risk, but less proven
- Hormonal IUD: Reliably reduces bleeding but inconsistently shrinks fibroids
- Menopause: Natural regression as hormone levels fall permanently
The right choice depends on your symptoms, whether you want to preserve fertility, how large and numerous your fibroids are, and how quickly you need relief. Medications can buy time or prepare you for a procedure, while embolization and focused ultrasound offer more durable results without major surgery.