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Red yeast rice, a natural source of lovastatin, may lower cholesterol and decrease fat buildup, but it’s much more difficult to find in the United States than it used to be. Read on to learn more about the history of this intriguing supplement and discover who might benefit.
What is Red Yeast Rice?
Red yeast rice is produced when a mold called Monascus purpureus colonizes and ferments rice. The mold turns the rice dark red and produces a medicinal compound called monacolin K. Red yeast rice has been a part of traditional Chinese medicine for over a thousand years; today, it is sold as a health food and supplement across the world.
Red yeast rice can be brewed into sake, vinegar, wine, and food pickling. In many East Asian countries, it is also used as a red food colorant.
This fascinating foodstuff may also reduce methane production by livestock. Methane, a potent greenhouse gas, might be the most dangerous byproduct of raising animals for food. When goats ate a diet containing 8.2% red yeast rice, the methane-producing bacteria in their guts was suppressed, and the goats released less methane.
Snapshot
Proponents:
- • Decreases cholesterol
- • Lowers blood pressure
- • Fights cancer
- • Improves metabolic syndrome
- • Prevents complications of obesity
- • Reduces inflammation
- • Improves bone health
Skeptics:
- • Amount of monacolin K not usually stated
- • Active ingredient controlled in the USA
- • May contain a kidney toxin
- • Potentially dangerous drug interactions
- • Some supplements may be spiked with lovastatin
Components
Red yeast rice contains, on average, 73.4% starch, 0.8% fiber, and 5.8% protein by weight. Its health effects are caused by a compound called monacolin K, the natural form of the cholesterol-lowering drug lovastatin.
Monacolin K
Monacolin K, which is chemically indistinguishable from lovastatin, is the main active component of red yeast rice. It is produced by Monascus purpureus, the red mold that ferments the rice and gives it its distinctive color.
The FDA regulates lovastatin, so commercial red yeast rice cannot be sold in the United States if it has more than a trace amount of monacolin K. However, many red yeast rice supplements do not have information about monacolin K on the label; multiple studies suggest that these supplements may contain significant amounts of this compound. It is currently impossible to know how much monacolin K a particular red yeast rice supplement contains without testing it in a lab.
Other Beneficial Compounds
Monascus purpureus produces several bioactive compounds which may be beneficial to our health. The most important of these are the monacolins and pigments. Red yeast rice contains at least 13 monacolins and several pigments.
Monascuspiloin (a yellow pigment) and rubropunctatin (a red pigment) may be used to boost the effectiveness of cancer treatments.
Citrinin
If red yeast rice is incorrectly fermented, it may contain a yeast toxin called citrinin. This poisonous compound causes kidney failure in animals and may cause mutations or damage in the DNA of cells.
In a red yeast rice supplement, citrinin has no known beneficial effect and should be avoided. Proper fermentation technique can prevent Monascus purpureus from producing citrinin.
Mechanism of Action
HMG-CoA reductase is an enzyme that converts a compound called HMG-CoA to mevalonate. Mevalonate is an essential building block for thousands of other molecules, including cholesterol. Monacolin K, like lovastatin, binds to HMG-CoA reductase and prevents the production of cholesterol.
Mevalonate can also be converted into important compounds like coenzyme Q10. Coenzyme Q10 is an antioxidant found in the mitochondria, the energy-making machinery of the cell. It may be responsible for the muscle-wasting side effects of lovastatin.
Red yeast rice doesn’t just contain monacolin K and its complete mechanism is more complex than lovastatin’s. According to some researchers, the other compounds in red yeast rice may, in fact, reduce the risk of side effects like muscle weakness.
Health Benefits (Likely Effective)
Multiple clinical trials have produced the following benefits of red yeast rice. Red yeast rice has not been approved by the FDA for any medical purpose or health claim; the FDA has further warned that monacolin K is an unapproved new drug. Talk to your doctor before supplementing with red yeast rice.
1) Cholesterol
High cholesterol is a serious health problem linked to obesity, insulin resistance, high blood pressure, heart attack, stroke, and diabetes. The most effective way to control cholesterol levels and prevent these conditions is to make healthy diet and lifestyle choices; however, some people are prone to high cholesterol regardless of these choices.
Red yeast rice lowers bad cholesterol (LDL) and triglycerides and raises good cholesterol (HDL) in the blood. It may also prevent weight gain and maintain normal levels of liver enzymes and leptin.
In multiple studies with almost 8,000 participants between them, people supplementing with red yeast rice had decreased LDL and total cholesterol, with no damage to liver or kidney function.
2) Heart Disease
Blood Triglycerides
Triglycerides, like cholesterol, are a type of fatty compound found in the blood. Recent studies have found that triglycerides are more likely than cholesterol to cause heart disease and stroke.
Red yeast rice lowers both cholesterol and triglycerides and measurably reduces the rate of heart attacks. In nearly 5,000 patients who had already suffered a heart attack, long-term red yeast rice supplementation lowered mortality rates by a third and cut the likelihood of a future heart attack in half, from 10.5% to 5.7%.
In combination with coenzyme Q10, red yeast rice also makes blood vessels more flexible. Stiff blood vessels, especially arteries, increase the risk of plaques forming in the vessels; these blockages can eventually lead to heart attack, stroke, and other complications.
Cardiac Inflammation
Chinese researchers have extensively studied xuezhikang, a red yeast rice extract, for its anti-inflammatory effects. In 50 patients with coronary heart disease, 1200 mg of xuezhikang per day produced decreased markers of inflammation and triglycerides.
In rats with high cholesterol, red yeast rice decreased the expression of genes that cause inflammation. The rats that ate the supplement had decreased levels of TNF-α and IL-6, two compounds that increase inflammation.
Monascustin, one of the active compounds of red yeast rice, may inhibit a gene called HDAC1. We do not yet fully understand how HDAC1 controls inflammation, but this relationship may be responsible for the anti-inflammatory effect of RYR.
Potential Benefits with Insufficient Evidence
At least one clinical trial has produced the following benefits of red yeast rice, but these studies have either not been repeated or produced contradictory results. Red yeast rice has not been approved by the FDA for any medical purpose or health claim; the FDA has further warned that monacolin K is an unapproved new drug. Talk to your doctor before supplementing with red yeast rice.
4) Metabolic Syndrome & Blood Sugar
Metabolic syndrome is a collection of conditions including obesity, high blood pressure, high blood sugar, insulin resistance, high levels of triglycerides, and low levels of good cholesterol (HDL). People with metabolic syndrome also have increased inflammation and are prone to inflammatory conditions.
Red yeast rice can lower cholesterol, blood pressure, and blood sugar; it also has anti-inflammatory and bone–strengthening effects. More research is required before doctors actively prescribe red yeast rice for metabolic syndrome; however, most of their hesitation has to do with citrinin toxicity and an inconsistent chemical profile. Red yeast rice is a useful nutraceutical for managing metabolic syndrome and obesity.
Animal Research (Lacking Evidence)
No clinical evidence supports the use of red yeast rice for any of the conditions listed in this section. Below is a summary of the existing animal and cell-based research, which should guide further investigational efforts. However, the studies listed below should not be interpreted as supportive of any health benefit.
5) Kidney Function
High cholesterol and triglycerides can cause serious kidney damage if left untreated. Through its effect on these fats, red yeast rice protected the kidneys from injury in a rat study.
The effect of red yeast rice on healthy kidneys is currently unknown. Furthermore, some red yeast rice may be contaminated with citrinin, which can cause kidney damage. We do not recommend red yeast rice as a supplement for kidney health.
6) Bone Health
In one rat study, red yeast rice reduced bone loss in rats with osteoporosis. Animals given red yeast rice supplements had higher bone mineral density and healthier bone cells than those without the supplement.
A study of white rabbits demonstrated a similar effect. In this study, however, the researchers added a red yeast rice extract to grafts and applied these grafts to a rabbit’s skull. The grafts that included red yeast rice extract showed improved bone growth compared to grafts without the extract.
Red yeast rice may increase the expression of the BMP2 gene, which is important for healing broken bones.
Cancer Research
Monascuspiloin, a yellow pigment in red yeast rice, can cause the death of prostate cancer cells by inhibiting mTOR and increasing AMPK. Through this same pathway, monascuspiloin makes cancer cells more sensitive to radiation and enhances the effectiveness of radiation therapies.
Another pair of compounds found in red yeast rice, rubropunctatin and monacolin L, are of interest to cancer researchers. Rubropunctatin may block telomerase, an enzyme that allows cancers to metastasize and move to different parts of the body. Meanwhile, monacolin L seems to increase the rate of apoptosis, or cell death, in the tumor.
These effects have not yet been studied in animal models, let alone in humans.
Supplement Combinations
Some research suggests that combining red yeast rice with other supplements could further improve its benefits and prevent adverse side effects. Talk to your doctor before adding any new supplements to your regimen, let alone combinations of supplements.
Coenzyme Q10
Red yeast rice, like lovastatin, decreases levels of a compound called coenzyme Q10, or CoQ10. CoQ10 is important for maintaining muscle mass and strength: this is why the most common side effect of statins is muscle disease. According to some practitioners, supplementing CoQ10 alongside red yeast rice may reduce the incidence of these side effects.
Healthy Fats
Healthy fats like rice bran oil (rather than coconut or sunflower) may further reduce cholesterol buildup while supplementing with red yeast rice. In one study, rats ate a very high cholesterol diet and supplemented with red yeast rice; the group of rats fed with rice bran oil had far lower cholesterol and oxidative stress when compared with rats fed other oils.
Berberine
Berberine is a compound found in several different medicinal plants. This compound has been a part of Chinese and Indian traditional medicine for thousands of years. Berberine is reported to increase LDL cholesterol receptors in the liver, thereby reducing LDL in the blood. In one human study, a
combination of berberine and red yeast rice reduced LDL as much as statin therapy, with a much lower rate of muscle damage.
Safety Considerations
Labeling and Regulation
There is currently no way to tell how much monacolin K, citrinin, or any other active compound is in a given red yeast rice supplement. Some red yeast rice supplements have been found to contain pure lovastatin, probably added during production. Almost all commercial supplements have different chemical profiles than the standardized red yeast rice that is used in clinical studies.
Lack of regulation is perhaps the biggest safety concern associated with red yeast rice supplements. If you are not confident in the safety of your supplement, we recommend switching or discontinuing it.
Pregnancy
Pregnant women should not use red yeast rice. Lovastatin has been associated with birth defects after exposure in the womb. The data is not conclusive, but most researchers caution against using any statin during pregnancy; this includes monacolin K.
Citrinin Toxicity
Citrinin is produced by molds and fungi and is often found in poorly stored food. Long-term exposure to citrinin can cause damage to the heart, liver, kidney, and reproductive system. High-quality red yeast rice does not contain enough citrinin to be dangerous; however, supplement bottles are unlikely to admit to citrinin content. Use caution and always buy high-quality supplements to avoid this toxin.
Side Effects
Since monacolin K is the same chemical as lovastatin, people taking red yeast rice and lovastatin may have similar side effects. Known side effects of lovastatin include muscle pain and weakness, nausea, heartburn, headache, and memory loss.
Muscle problems are among the most commonly reported side effects of all statins, ranging from slight pain to severe muscle breakdown. People with existing muscular conditions like myasthenia gravis should avoid red yeast rice: monacolin K may worsen their symptoms.
Lovastatin is also known to suppress the immune system This property could be helpful for people with autoimmune diseases but it may also make it more difficult to fight off infection.
Other compounds found in red yeast rice may compensate for some of the negative side effects of monacolin K. People taking red yeast rice as a supplement usually have fewer side effects than those taking lovastatin.
Rare Allergy
Some people may have a very rare allergy to Monascus purpureus. In one case, a young and otherwise healthy butcher developed a severe anaphylactic reaction just from handling red yeast rice as an ingredient for sausage.
Limitations and Caveats
Most, but not all, of the above health effects and safety considerations refer to studies on red yeast rice: some refer to studies on lovastatin. The FDA considers lovastatin and monacolin K from red yeast rice to be chemically identical; the other bioactive compounds in red yeast rice may change the effect of monacolin K on the human body. The effects of lovastatin and red yeast rice will, therefore, be very similar, but not exactly the same.
Most red yeast rice supplements do not contain a standardized amount of monacolin K and other bioactive compounds. The effects of different supplements may vary, and researchers using different extracts may reach different conclusions.
Drug Interactions
Few drugs have been specifically tested for interactions with red yeast rice. However, because monacolin K is identical to lovastatin, drugs that interact with lovastatin should not be combined with red yeast rice.
Verapamil
Verapamil treats high blood pressure, angina, and irregular heartbeat. Red yeast rice and lovastatin both increase the availability and effect of verapamil. If you are taking verapamil for any reason, consult your doctor before supplementing with red yeast rice.
Lovastatin Interactions
Many drugs have demonstrated interactions with statins. These include:
- • Erythromycin
- • Clarithromycin
- • Antifungals that end with -azole (such as itraconazole)
- • Antiviral drugs
- • Warfarin
- • Cholesterol-lowering drugs like gemfibrozil
- • Colchicine
- • Heart medication like amiodarone
- • Danazol
- • Immunosuppressants like cyclosporine
- • Cimetidine
Talk to your doctor before using red yeast rice supplements if you are currently taking any of these medications.
Grapefruit
Like some of the drugs above, grapefruit blocks an enzyme called CYP3A4 and prevents statins from being broken down. These statins can then build up to dangerously high levels and cause serious muscle problems. Even a single glass of grapefruit juice with lovastatin could be dangerous; we recommend avoiding grapefruit if you are supplementing with red yeast rice.
Other foods that increase or decrease CYP3A4 activity will also decrease or increase the effect of red yeast rice.
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Genetics/Genetic Predispositions
Familial Hypercholesterolemia
Familial hypercholesterolemia is a genetic condition that causes very high levels of bad cholesterol (LDL) to build up and remain in the blood, regardless of diet and lifestyle. This condition is under-diagnosed and under-treated; genetic testing is not offered in all countries.
Familial hypercholesterolemia is often treated with statins such as lovastatin. Red yeast rice lowers LDL cholesterol and may be especially beneficial to people with this disease.
Mutations at any one of four genes cause familial hypercholesterolemia. These genes are:
- LDLR, which normally produces the LDL receptor. A mutation here reduces the body’s ability to get rid of LDL. This type of mutation accounts for 85 – 90% of all cases of familial hypercholesterolemia.
- ApoB, which normally allows LDL to bind to its receptor. This type of mutation accounts for 5 – 10% of all cases.
- PCSK9, which normally degrades LDL receptors. When PCSK9 is too active, it has a similar effect to an LDLR mutation. This type of mutation is rare.
- LDLRAP1, which normally allows LDL receptors to cross the cell membrane and enter the cell. This type of mutation is rare; two copies are required to cause familial hypercholesterolemia.
SNPs associated with hypercholesterolemia include: rs693, rs7575840, rs4420638, rs12654264, rs1529729, rs688, and rs11591147. Certain variations in these SNPs have been associated with heart disease; people who carry them may benefit the most from red yeast rice.
CYP3A4
CYP3A4 is an enzyme that breaks down many drugs and other substances, including lovastatin. Variations in the CYP3A4 gene may cause different people to respond differently to red yeast rice.
Variations in some SNPs are associated with decreased CYP3A4 activity, including rs2740574, rs67666821, rs35599367 and rs4987161. People with certain variations in these SNPs may have a stronger response to red yeast rice because CYP3A4 will take longer to break down monacolin K.
Variations in other SNPs are associated with increased CYP3A4 activity, including rs4986910 and rs2737418. People with specific variations in these SNPs may have a weaker response to red yeast rice because CYP3A4 will clear monacolin K more quickly.
Women also have higher CYP3A4 activity than men and may have a weaker response to red yeast rice.
Supplementation
Red yeast rice can be eaten as is, ground up into a powder, or purified into an extract. Xuezhikang is a partially purified extract found primarily in China. Clinical studies should use standardized red yeast rice with known quantities of active compounds.
Some red yeast rice supplements are sold in combination with coenzyme Q10, ostensibly to prevent or reduce muscle damage.
If you choose to supplement with red yeast rice, keep in mind that there is currently no way to tell how much monacolin K, citrinin, or other compounds are in each supplement without lab testing. Companies are not required to give this information on the label.
Cholestin
Before it was outlawed by the FDA, red yeast rice extract was sold in the USA as a supplement called Cholestin. You or someone you know may have used Cholestin before the turn of the century. People who responded well to Cholestin may likewise respond well to red yeast rice; talk to your doctor to see whether this is an appropriate option for you.
Dosage
There is no safe and effective dose of red yeast rice because no sufficiently powered study has been conducted to find one.
Clinical studies use a purified extract of red yeast rice that is guaranteed to contain a certain percentage of monacolins. In one such study, 10 mg of monacolins per day, from purified extract, safely reduced cholesterol and prevented harmful changes to blood vessels. It also lowered hs-CRP, a protein that increases during inflammation.
In another study, 2.4 g of red yeast rice per day reduced cholesterol and blood triglycerides. The correct dosage depends on the purity and form of the supplement.
Red Yeast Rice: Benefits, Side Effects and Dosage
It’s turned up on pharmacy shelves only within the last few decades, but red yeast rice has been prized for its powerful medicinal properties for hundreds of years.
As one of the top natural remedies for high cholesterol levels, red yeast rice is one of the few natural supplements that contain active ingredients virtually identical to those found in prescription medications.
Plus, the benefits of red yeast rice extend beyond correcting cholesterol levels, with emerging research showing that it may also benefit inflammation, metabolic syndrome, blood sugar levels and more.
Here are the benefits, side effects and dosage recommendations for red yeast rice.
What Is Red Yeast Rice?
Red yeast rice is a type of fermented rice that is produced using a specific species of mold.
It’s been used in traditional Chinese medicine for centuries for its powerful health-promoting properties.
Red yeast rice contains the compound monacolin K — the same active ingredient found in prescription cholesterol-lowering medications like lovastatin.
For this reason, it’s often used as a cost-effective alternative to pricey medications to help reduce cholesterol levels and support heart health.
Research has shown other beneficial effects as well, ranging from reduced cancer cell growth to improved blood sugar and insulin levels.
Today, red yeast rice is commonly sold as an over-the-counter supplement marketed to help manage cholesterol and improve overall health.
May Promote Heart Health
Heart disease is a serious condition that affects millions and is estimated to account for 31.5% of deaths around the world.
High cholesterol — one of the main risk factors for heart disease — can cause arteries to narrow and stiffen, leading to an increased risk of heart attack and stroke.
Red yeast rice is commonly used as a natural remedy to help lower cholesterol levels and promote heart health, often with less adverse side effects than prescription drugs used to treat high cholesterol.
One study in 25 people showed that red yeast rice lowered total cholesterol by an average of 15% and “bad” LDL cholesterol by 21% over about two months of treatment.
Similarly, an eight-week study in 79 people reported that taking 600 mg of red yeast rice twice daily significantly reduced “bad” LDL cholesterol levels, compared to a control group.
What’s more, one review of 21 studies found that red yeast rice was effective at reducing levels of total and “bad” LDL cholesterol, as well as triglycerides and blood pressure, when combined with statin drugs.
May Help Treat Metabolic Syndrome
Metabolic syndrome is a cluster of conditions that increase your risk of chronic conditions, such as heart disease, diabetes and stroke.
Some of the criteria for metabolic syndrome include high blood pressure, excess body fat, increased blood sugar and alterations in cholesterol or triglyceride levels.
Several studies have found that red yeast rice may help treat some of these risk factors and could be used as a natural treatment to aid in its prevention.
One of its most well-documented effects is its ability to lower cholesterol. Research shows that it can effectively reduce both total and LDL cholesterol levels.
Another small, 18-week study found that a supplement containing red yeast rice was able to reduce blood sugar, insulin levels and systolic blood pressure (the top number of a reading) in people with metabolic syndrome.
Plus, an eight-week study looked at the effects of red yeast rice on mice fed a high-fat diet compared to a control group. It found that red yeast rice was able to prevent increases in cholesterol levels and body weight.
Could Reduce Inflammation
Inflammation is a normal immune response designed to protect your body against acute infections and foreign invaders.
However, sustained inflammation is thought to contribute to chronic conditions like diabetes, cancer and heart disease.
Studies show that supplementing with red yeast rice may help reduce inflammation and promote better health in the long term.
For example, a study in 50 people with metabolic syndrome showed that taking a supplement containing red yeast rice and olive extract reduced levels of oxidative stress — a key cause of chronic inflammation — by up to 20%.
Similarly, one study found that giving red yeast extract to rats with kidney damage reduced levels of specific proteins involved in inflammation in the body.
May Have Anticancer Properties
Although current research is limited to animal and test-tube studies, some evidence suggests that red yeast rice may help reduce the growth and spread of cancer cells.
One study found that giving mice with prostate cancer red yeast rice powder significantly decreased tumor volume compared to a control group.
Similarly, a test-tube study showed that treating prostate cancer cells with red yeast rice was able to decrease cancer cell growth to a greater degree than lovastatin, a cholesterol-lowering medication with anticancer effects.
However, more research is needed to evaluate the effects of red yeast rice on other types of cancer in humans.
Specifically, further studies should be done to determine how the potential anticancer effects of red yeast rice may affect the general population.
Many Supplements Contain Minimal Monacolin K
Monacolin K is the active compound found in red yeast rice that is commonly extracted and used in cholesterol-lowering statins and medications.
It’s typically credited with the majority of the health benefits attributed to red yeast rice, especially regarding its cholesterol-lowering properties.
According to the FDA, red yeast rice products that contain monacolin K should be considered a drug, subjecting them to stricter regulations than standard over-the-counter supplements.
Since 1998, the FDA has taken action against several companies selling red yeast rice extract, noting that it’s illegal to market these products as supplements in the US.
In recent years, a number of red yeast rice supplements have popped up, many of which evade FDA regulations by containing only trace amounts of monacolin K.
However, it remains unclear how effective these products really are and whether they have the same benefits on health as true red yeast rice.
May Cause Side Effects for Some People
Despite the long list of benefits associated with red yeast rice, supplementing with it may come with some adverse effects.
Gastrointestinal problems like bloating, gas and stomach pain are some of the most commonly reported side effects of red yeast rice.
In more extreme cases, it can also cause issues like muscle problems, liver toxicity and allergic reactions, similar to the side effects caused by prescription cholesterol-lowering medications.
For this reason, it’s important to stick to the recommended dosage and buy from a reputable retailer to ensure you’re getting the best quality possible.
Because research is still limited on the long-term safety of red yeast rice, it’s also not recommended for those currently taking statins or women who are pregnant or breastfeeding.
If you notice any adverse symptoms after taking red yeast rice, consider decreasing your dosage or discontinuing use and consult a trusted healthcare practitioner.
Dosage Recommendations
Red yeast rice is available in capsule or tablet form and often formulated in combination with other ingredients, such as CoQ10, nattokinase or omega-3 fatty acids.
These supplements are widely available in health food stores, pharmacies and though online retailers.
Doses ranging from 200–4,800 mg have been studied in clinical trials, typically containing about 10 mg of total monacolin.
Most major supplement brands on the market generally recommend taking between 1,200–2,400 mg daily, divided into two to three doses.
However, given the risk of adverse side effects and safety concerns associated with red yeast rice extract, it’s best to speak with your doctor to determine the best dosage for you.
The Bottom Line
Red yeast rice may support heart health and reduce cholesterol levels, inflammation, cancer cell growth and risk factors of metabolic syndrome.
It can cause gastrointestinal issues, allergic reactions, liver toxicity and muscle problems and is not recommended for people taking statins or women who are pregnant or breastfeeding.
Most supplements recommend 1,200–2,400 mg daily. However, many products on the market today contain minimal amounts of its active ingredient, potentially negating any health benefits associated with red rice extract.
Working closely with your doctor and selecting a high-quality supplement from a reputable brand is the best way to take advantage of the unique benefits that this potent ingredient has to offer.
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