Can You Shrink a Meningioma Naturally?

No natural remedy has been proven in clinical trials to shrink a meningioma in a living human being. The supplements, diets, and herbal extracts you will find promoted online have either been tested only in lab dishes and animal models, or they address swelling around a tumor rather than the tumor itself. That said, some meningiomas do shrink on their own, and the reasons they do so point to a fascinating hormonal mechanism that blurs the line between “natural” and “medical.” Understanding what the research actually shows can help you have a better conversation with your neurosurgeon and avoid wasting time or money on unproven treatments.

Some Meningiomas Do Shrink on Their Own

Spontaneous regression of a meningioma, meaning the tumor gets smaller without surgery or radiation, is rare but well documented. A 2025 literature review identified 21 published cases and found that in about a third of them, no identifiable cause could be pinpointed at all; the tumor simply shrank over years of observation.¹ In one case, a man’s petroclival meningioma was tracked with MRI for 13 years and shrank from roughly 2.5 cubic centimeters to about 1 cubic centimeter without any treatment.² Another report described a posterior fossa meningioma that stayed the same size for two years, then shrank to about a quarter of its original volume over the next decade.³

These are fascinating case reports, but they are exactly that: individual cases, not evidence that you can count on your meningioma doing the same thing. Still, the pattern behind many of them is revealing and worth understanding, because it connects to the strongest body of evidence in this whole topic.

The Hormonal Connection Is the Strongest Lead

Meningiomas are unusual among brain tumors in that many of them carry progesterone receptors and sometimes estrogen receptors. This is one reason meningiomas are roughly two to three times more common in women than men, and it is why pregnancy can accelerate their growth.⁴ The flip side of that hormonal sensitivity is that when progesterone-like stimulation stops, some meningiomas shrink dramatically.

The clearest examples come from patients who were taking synthetic progestins for other medical conditions. In a French series of three patients taking nomegestrol acetate (a progestin used for gynecological conditions), all three experienced meningioma shrinkage within the first month after stopping the drug, and one patient’s tumor lost up to 70 percent of its volume during the first year.⁵ Two other patients with large meningiomas scheduled for surgery saw their tumors shrink by more than 80 percent after simply stopping progestin treatment, dropping from over 60 cubic centimeters to around 11 to 13 cubic centimeters within a year.⁶ A separate case report documented shrinkage of multiple meningiomas within four months of discontinuing megestrol.⁷

The broader literature review mentioned earlier found that hormonal changes and drug-related factors accounted for about 62 percent of the documented spontaneous regressions, with the discontinuation of progesterone-like drugs being the single most common trigger.¹ Menopause, with its natural decline in sex hormones, was linked to regression in individual cases as well.³

If you are currently taking a progestin medication and you have a meningioma, this is a genuinely important conversation to have with your doctor. It is not a “natural” remedy in the way most people mean the word, but it is one of the few interventions where removing a chemical exposure has led to real, measurable tumor shrinkage in actual patients. The decision to stop any medication obviously involves weighing the medical need for that medication against the potential tumor benefit.

Curcumin, Resveratrol, and the Lab-to-Bedside Gap

Curcumin, the yellow compound in turmeric, is probably the most-hyped natural substance in meningioma discussions online. The lab research is real: curcumin has been shown to reduce the growth of human meningioma cells in culture and to trigger programmed cell death at higher concentrations.⁸ A more recent study found that curcumin blocked a growth-factor-driven pathway in meningioma cells and inhibited tumor growth in mice that had been implanted with meningioma tissue.⁹

Resveratrol, the compound found in grape skins and red wine, follows a similar pattern. In meningioma cell lines, it reduced cell growth and triggered cell death in a dose-dependent way.¹⁰

Here is the problem: killing tumor cells in a dish or slowing tumors in a mouse is not the same as shrinking a tumor inside a human skull. The concentrations of curcumin used in these experiments are far higher than what you can achieve in your bloodstream by eating turmeric or taking a supplement. Curcumin is notoriously poorly absorbed by the gut, and very little of what does get absorbed crosses the blood-brain barrier. No clinical trial has tested whether curcumin supplements shrink meningiomas in people. The same is true for resveratrol. These are interesting leads for drug development, not treatments you can use today.

Boswellia Reduces Swelling, Not the Tumor Itself

Boswellia serrata, an extract from Indian frankincense, is another supplement that comes up in brain tumor conversations. It deserves a careful distinction, because it does have some clinical evidence behind it, just not for what most people think.

A placebo-controlled pilot trial in brain tumor patients undergoing radiation therapy found that 60 percent of patients taking Boswellia experienced a greater than 75 percent reduction in brain swelling, compared to 26 percent in the placebo group.¹¹ A larger study in patients with radiation-induced brain injury after radiosurgery for brain metastases found an overall response rate of about 60 percent for reducing radiation necrosis and associated edema.¹²

What Boswellia appears to do is reduce the swelling around a tumor or the inflammation caused by radiation treatment. That can meaningfully improve symptoms like headaches or neurological deficits. But reducing edema and shrinking the actual tumor mass are different things. Boswellia has not been shown to make a meningioma itself smaller. If you are dealing with edema-related symptoms, it is worth discussing with your medical team, but you should not expect it to replace surgery or radiation for the tumor itself.

Why the Ketogenic Diet Probably Does Not Work Here

The ketogenic diet has attracted attention in brain cancer research based on a theory that tumor cells cannot efficiently burn ketone bodies the way healthy brain cells can, so starving the brain of sugar and forcing it to run on ketones should selectively harm the tumor. The theory has some support for certain aggressive brain cancers, but the evidence for meningiomas is discouraging.

An imaging study using carbon-labeled tracers directly measured whether brain tumors could use ketone bodies as fuel. Both meningioma patients in the study were efficiently oxidizing ketone bodies in their tumors, with the tumors deriving a large fraction of their energy from this alternative fuel source. The researchers concluded that their findings imply the ketogenic diet may not be effective for brain tumor patients.¹³ In other words, the meningioma cells were happy to eat ketones. Cutting carbs would not starve them.

This is a small study, and more research could change the picture, but it undercuts the central assumption behind using a ketogenic diet for this specific tumor type. If you are following a ketogenic diet for other health reasons, that is fine, but there is no reason to believe it is treating your meningioma.

Obesity and Meningioma Risk

While no lifestyle change has been shown to shrink an existing meningioma, body weight does appear to play a role in the risk of developing one. A large meta-analysis found that obesity raised the risk of meningioma in both women and men, with obese women facing roughly 48 percent higher risk and obese men roughly 78 percent higher risk compared to people of normal weight.¹⁴ A Mendelian randomization study, which uses genetic variants to test whether the association is causal, found support for a positive relationship between body mass index, body fat percentage, and meningioma risk.¹⁵

A Norwegian population-based cohort study found that diabetes and hypertension increased meningioma risk in women, though body mass index alone was not a significant predictor in that particular study.¹⁶ The mechanism probably relates back to hormones: fat tissue produces estrogen, and metabolic syndrome can alter the hormonal environment in ways that promote the kind of cell growth meningiomas thrive on.

Whether losing weight after a meningioma diagnosis could slow growth or promote regression has not been studied directly. But given the hormonal link, maintaining a healthy weight and managing metabolic conditions like diabetes seem like reasonable parts of an overall health strategy.

Most Meningiomas Grow Slowly, and Many Stop on Their Own

One reason the “can I shrink it naturally?” question arises so often is that many meningiomas are found incidentally, during a brain scan done for an unrelated reason, and the immediate recommendation is often just to watch. This can feel frightening and passive, but the growth data is reassuring for most patients.

A prospective long-term study that followed 68 incidental meningiomas for up to 12 years found that the growth rate typically decelerated over time. By 5 years of observation, about 87 percent of tumors had shifted into a self-limiting growth pattern, and by 10 years that figure reached about 94 percent.¹⁷ More than half of the tumors that initially appeared to be growing in a worrying pattern eventually slowed down on their own. The study found that roughly 60 percent of tumors overall displayed self-limiting growth by the end of follow-up.

This does not mean every meningioma stops growing. Some do keep expanding and eventually require intervention. But it does mean that the passage of time itself is often the most important variable. Your neurosurgeon is not being neglectful by recommending active surveillance with periodic MRI scans. For many patients, the tumor simply stops being a clinical problem.

When Treatment Is Needed, Radiation Is Effective

For meningiomas that do require treatment, stereotactic radiosurgery or fractionated radiation therapy has a strong track record. A mathematical modeling study of 48 meningioma patients who underwent radiation found that 75 percent experienced at least a 50 percent decrease in tumor volume over the follow-up period, and the median time to achieve the predicted volume reduction was just over one year. Only about 10 percent experienced post-radiation growth.¹⁸

Knowing that a proven, effective, and often minimally invasive treatment exists should factor into how you weigh unproven natural approaches. The risk of delaying or foregoing a treatment that has a 75 percent chance of meaningfully shrinking your tumor in favor of turmeric supplements that have never been tested in humans is real and worth thinking about honestly.

Supplements and Your Treatment Team

About 30 percent of brain tumor patients use some form of complementary or alternative therapy, and many do not mention it to their doctors.¹⁹ This is a problem beyond just efficacy. Herbal supplements can interact with medications, including anti-seizure drugs and steroids that are commonly prescribed alongside brain tumor management. Some supplements affect blood clotting, which matters if surgery is ever on the table.

There is also the vitamin D angle. A study of Turkish brain cancer patients found that a particular variant of the vitamin D receptor gene was associated with a roughly sixfold higher risk of meningioma.²⁰ This suggests that the vitamin D signaling pathway may play a role in meningioma susceptibility. However, it does not mean that taking vitamin D supplements will shrink an existing tumor. A genetic association with risk and a treatment effect are very different things. No study has tested vitamin D supplementation as a meningioma treatment.

If you are going to use supplements alongside conventional treatment, tell your neuro-oncologist or neurosurgeon what you are taking. Do not assume that “natural” means “harmless” or “irrelevant to my other medications.”

Stress, Mindset, and Meningioma

You may have come across claims that stress contributes to meningioma growth or that stress reduction could help shrink one. A study from a neurosurgical hospital compared perceived stress levels in meningioma patients and people without meningiomas. While meningioma patients reported higher rates of perceived high stress, they actually reported less chronic stress overall than the comparison group across domains like work, finances, and relationships. The researchers concluded that they did not find a significant association between stress and meningioma.²¹

That does not mean managing stress is unimportant when you are living with a brain tumor diagnosis. Anxiety and fear are rational responses to the situation, and addressing them improves quality of life. Meditation, exercise, therapy, and social support are all worth pursuing for their own sake. But the evidence does not support the idea that lowering your stress level will make a meningioma shrink.

Cell Phones and Meningioma Risk

Since we are clearing up common anxieties around meningiomas, the cell phone question deserves a brief mention. Multiple large studies have now examined whether radiofrequency electromagnetic fields from mobile phones increase meningioma risk, and the answer is consistently no. The COSMOS prospective cohort study found no evidence of increased risk for meningioma with mobile phone use.²² A Japanese case-control study found no increasing trend in meningioma risk with cumulative call time or estimated radiation dose to the brain.²³ A German study specifically looking at cordless phone base stations reached similar null results.²⁴

You do not need to change your phone habits in response to a meningioma diagnosis, and avoiding your phone will not affect your tumor. The research on this is remarkably consistent.

Endocannabinoids in Meningioma Tissue

One intriguing finding that sometimes surfaces in discussions of cannabis and brain tumors involves the endocannabinoid system. A biochemical study found that meningioma tissue contains dramatically elevated levels of certain endocannabinoids, about 20-fold higher than normal brain tissue for a compound called 2-arachidonoyl glycerol. The authors speculated that these elevated endocannabinoids might actually function as the body’s own anti-tumor agents, acting through both cannabinoid receptor and non-cannabinoid receptor pathways.²⁵

This is the kind of finding that gets wildly overinterpreted on cannabis advocacy websites. It tells us something interesting about the biology of meningiomas, but it does not tell us that smoking marijuana or taking CBD oil will shrink a meningioma. The endocannabinoids in question are produced locally within the tumor tissue, and their levels are measured in picomoles per unit of lipid. Eating or inhaling cannabis products does not replicate this localized biochemical environment. No clinical trial has tested any cannabinoid product as a meningioma treatment, and the gap between this basic science observation and a usable therapy is vast.