Can Red Yeast Rice Lower Cholesterol?

Jo Clark had just graduated from college when her mother died of a massive heart attack at age 57. “She had no known risk factors,” says Clark, 65, a retired journalist who lives in Los Angeles. “She didn’t drink or smoke, she exercised, and she was in glowing good health.” The tragedy, she adds, “left an enormous hole in my life.”

It also made Clark fear she was at risk of a similar fate — an anxiety confirmed in her 30s, when she began experiencing chest pains that were eventually traced to a genetic clotting disorder. In her 40s, she went on blood thinners as a preventive measure. And when her cholesterol levels rose to a point that concerned her cardiologist, she began taking atorvastatin (a statin marketed as Lipitor), the most widely prescribed drug in America.

Statin drugs come in seven varieties, which also include lovastatin, rosuvastatin, fluvastatin, simvastatin, pravastatin, and pitavastatin. They all work in essentially the same way: by reducing production of artery-clogging “bad” cholesterol (low-density lipoprotein, or LDL) and boosting production of “good” cholesterol (high-density lipoprotein, or HDL), which carries the bad stuff back to the liver to be removed. For most people who take them, statins do their job with quiet efficiency. But like other medications, they can also trigger unpleasant or harmful side effects.

Clark experienced one of the most common of those afflictions — muscle pain. “The leg cramps were so intense that I’d be hopping around and screaming,” she recalls. “They often came on at night, and they lasted a really long time.” The symptoms vanished, she says, when she stopped taking the statin for a few days.

An acquaintance suggested an alternative: a supplement known as red yeast rice. Researching the substance online, Clark found countless testimonials from satisfied users, as well as scientific studies (albeit mostly small and of questionable quality) suggesting that it could work as well as statins for many people, with a lower risk of side effects. At the time, when generic statins were not yet widely available, this option — sold alongside vitamins and herbal capsules — was often cheaper, too.

Clark hurried to her nearest Costco and bought a big bottle. She hoped she’d found a solution that would control her cholesterol without causing her agony.

A Supplement With No Standard Formula

Each year, large numbers of Americans take the same gamble Clark did. U.S sales of red yeast rice supplements reached an estimated $92 million in 2025, up from $68 million in 2021.

Some customers turn to such products after experiencing side effects from statins, which can include not only muscle pain but also (in rare cases) potentially life-threatening muscle breakdown and liver damage. Others may want to avoid the slightly increased risk of diabetes and short-term cognitive dysfunction associated with these medications. Or they may simply distrust pharmaceutical drugs in general, preferring “natural” remedies.

Unfortunately, however, this quest for a safer alternative poses risks of its own.  

At first glance, red yeast rice seems to have little in common with the lab-bred creations of Big Pharma. Used for centuries in China as both a medicine and a health-promoting food, it’s traditionally made by fermenting white rice with red wine mash, grass juice, and alum water. Supplement makers take a more streamlined approach, fermenting cooked rice with a fungus called Monascus purpureus. The product is then dried, pulverized, and formed into pills or capsules.

Yet despite their very different origins, red yeast rice and statins share the same biochemical roots. Searching for fungal compounds that could safely reduce cholesterol, researchers at the biotech giant Merck found one in a common soil fungus. The company dubbed their discovery lovastatin and developed a method for synthesizing it in bulk. The first drug of its kind, it was approved by the Food and Drug Administration (FDA) in 1987 and marketed as Mevacor. 

Compounds identical to lovastatin are also found in other fungi — and one of them, known as monacolin K, is the active ingredient in red yeast rice.

The Regulatory Gray Zone of Monacolin K

Studies have found that red yeast rice supplements containing robust quantities of monacolin K (at least 4.8 mg) can lower cholesterol as effectively as first-generation statins. Indeed, when red yeast rice supplements first hit the market in the 1990s, their monacolin content, and their kinship to lovastatin, was often touted on their labels.

In 1998, however, the FDA banned the sale of red yeast rice products containing more than trace amounts of monacolin K, deeming them unapproved new drugs. (Traditional red yeast rice, officials explained, contained little or no lovastatin equivalent, so any supplement with enough to lower cholesterol was essentially a Mevacor knockoff.) However, the agency lacked the will or resources to test every bottle. Instead, though it has issued warnings to a few manufacturers, sales have continued on a “don’t ask, don’t tell” basis.

Unlike other supplements, whose labels often list the quantity of active ingredients (for example, the proportion of ginsenosides in ginseng extract), the packaging for red yeast rice products does not mention monacolin, let alone how much of it each pill contains. “It’s a Catch-22, and it’s obviously not good for the consumer,” says Tod Cooperman, M.D., president of the member-supported supplement watchdog group ConsumerLab.com.

Dosage Roulette

In fact, the only way for a buyer to determine a red yeast rice product’s potency is to purchase a subscription to ConsumerLab, which publishes analyses of selected brands every four years or so. Products are chosen according to their popularity among the group’s members, who tend to be heavy supplement users. This year, only two of the seven brands tested had levels of monacolin K (or a closely related variant, KA) shown to be effective in placebo-controlled clinical trials. 

These results are consistent with several scientific studies showing wildly varying levels of the active ingredient among red yeast rice products. ConsumerLab’s findings also show how a single brand’s potency can change over time. The top-rated supplement in 2026, for example, contained 8 mg of lovastatin equivalent per 1,200-mg dose (two pills). The same product contained about 12 mg per dose in 2014, 6 mg in 2018, and 7 mg in 2022.

“Imagine going to your medicine cabinet and deciding to take five statin pills or half a pill instead of one,” says Steven Nissen, M.D., a preventive cardiologist at the Cleveland Clinic. “That’s what’s going on with red yeast rice. You never know what you’re getting.”

“Imagine going to your medicine cabinet and deciding to take five statin pills or half a pill instead of one. That’s what’s going on with red yeast rice. You never know what you’re getting.”

Dr. Nissen led a study published in 2023 in the Journal of the American College of Cardiology comparing the effects of low-dose rosuvastatin to six different supplements on cholesterol and other blood-lipid levels. {The study was funded by AstraZeneca, the developer of rosuvastatin.) Results favored the statin, with an average reduction of 38% in LDL over 28 days. Next came a top-selling brand of red yeast rice, with a reduction of just 7% — not enough to be clinically significant for patients at high cardiovascular risk. Still, it did better than might have been expected: in the previous year’s ConsumerLab report, the brand had been found to contain no monacolin K whatsoever.

Apparently, the quantity had risen a bit since then.

The Specter of Contamination

This variability reflects a larger problem with supplements in the United States: they’re regulated far less strictly than pharmaceuticals. And the element of surprise also applies to unwanted substances you might find in a bottle of red yeast rice capsules. 

One such intruder is citrinin, a toxin that can result from improper fermentation of rice and other grains. In animals, citrinin has been shown to damage the kidneys, and similar effects are suspected in humans. In 2022, ConsumerLab found citrinin in three of the red yeast rice products it tested, including two whose labels proudly declared them “Citrinin Free.” This year, no citrinin was detected in the brands that were evaluated. Nonetheless, Dr. Cooperman cautions, “I wouldn’t doubt that it’s in many other products on the market right now.”

Although supplements are inspected more rigorously in some other countries, it’s important to note that the problem of contamination is not limited to America. A 2021 study by Italian researchers turned up citrinin in all 37 of the global red yeast rice products the team tested. Nor is this toxin the only source of worry. In 2024, Japanese authorities recalled three red yeast rice products made by Kobayashi Pharmaceutical after dozens of consumers fell severely ill; eventually, the supplements were blamed for over 70 deaths and 500 hospitalizations. The culprit was found to be puberulic acid, produced by blue mold.

No such disasters have been associated with red yeast rice outside of Japan. Still, says Dr. Cooperman, there’s little reason to consider any supplement a safer bet than its pharmaceutical counterpart. “Especially with small companies, we’ve seen manufacturing problems that don’t get fixed,” he explains. “With these products, there are no guarantees.”

A Familiar Set of Side Effects

Inconsistent ingredients are not the only reason to be wary of red yeast rice supplements. Another hazard, even with the best-made products, stems from the fact that monacolin K is chemically identical to lovastatin. That means both substances can trigger precisely the same side effects.

Research shows that red yeast rice can be tolerated by some patients who experience severe muscle pain with statins, perhaps thanks to other naturally occurring compounds that act synergistically with monacolin K. However, complications do crop up — some of them dangerous.

Eleanora Fedonenko, M.D., an internist and dermatologist in Los Angeles, says she had a patient in her 50s who refused to take a statin to lower her high cholesterol. Instead, the woman declared she would rely on diet and exercise, which can only seldom bring down significantly elevated numbers enough to reduce cardiovascular risk. A few months later, a blood test showed remarkable results, both positive and negative: her lipids had decreased by 22 percent, but her liver enzymes had skyrocketed. When the woman came in for a checkup, her eyes were yellow with jaundice. “I asked her, what’s going on?” the doctor recalls. “Are you taking anything I’m not prescribing?” The patient confessed she’d been dosing herself with red yeast rice.

Dr. Fedonenko ordered her to stop the pills, and after several weeks, the woman’s enzyme counts returned to normal. “She was lucky to come in when she did, or she could have had serious liver failure.” The patient eventually went on a statin, which produced no adverse effects.

“She was lucky to come in when she did, or she could have had serious liver failure.”

Other people taking red yeast rice have been hospitalized for rhabdomyolysis, a severe breakdown in muscle tissue that is also a rare side effect of statins, and at least one has suffered rhabdomyolysis and liver damage at the same time. Based on such reports, the European Food Safety Authority (EFSA) restricts the daily dosage of red yeast supplements to a maximum of 3 mg of monacolin K — less than the clinically effective level.

Balancing the Risks and Potential Benefits of Red Yeast Rice

All these caveats don’t mean that red yeast rice never works, or that it’s invariably injurious. What they do suggest, however, is that you should think twice (or more) before taking it. And if you choose to go ahead, you should do so with the utmost caution. “Make sure your healthcare provider is involved,” Dr. Cooperman stresses. “There are plenty of people using these products successfully, but a lot of people are potentially harming themselves.”

“There are plenty of people using these products successfully, but a lot of people are potentially harming themselves.”

Given the uncertainties around red yeast rice, some physicians want nothing to do with it. There are other options for patients who experience side effects from statins, they point out, whether it’s taking them less frequently, switching to a different formula, or trying one of the newer cholesterol medications, such as ezetimibe, PCSK9 inhibitors, or bempedoic acid. These drugs, though often difficult to cover through insurance, can offer some patients an effective alternative. 

Other doctors are willing to give red yeast rice a chance, if they calculate that the potential benefits outweigh the risks. Among that number is cardiologist Ram Gordon, M.D.. He first learned of the substance two decades ago, when he joined the Philadelphia-area practice of David Becker, M.D., a pioneer in preventive cardiology.

“David had a bunch of patients whose cholesterol numbers looked much better than they did six months earlier, and he’d say, ‘I’m so glad you’re taking the Lipitor I gave you,’” Dr. Gordon recalls. “They’d get this sly smile and say, ‘Dr. Becker, I’m not taking Lipitor.’” The source of their improvement, it seemed, was an ancient Chinese fungal preparation.  

In 2009, Dr. Gordon and his mentor conducted the first randomized, placebo-controlled clinical trial of red yeast rice as a treatment for people who can’t handle statins. That small study, which found that most participants achieved significant reductions in LDL with few major side effects, is still widely cited as evidence of the supplements’ efficacy and tolerability. But the following year, the pair conducted a study with Dr. Cooperman, revealing extreme variability in monacolin levels, as well as widespread citrinin contamination, in a sampling of 12 red yeast rice products. The subtitle of their paper was “Buyer Beware!”

Dr. Gordon, who now runs his own practice in suburban Connecticut, brings that balance of openness and scientific rigor to his clinical interactions. “I’m not a touchy-feely cardiologist,” he says. “I believe in the data.” When patients with high cholesterol say they want to try red yeast rice, he usually talks them into statin therapy — a task made easier by his deep knowledge of both treatments. “If a guy comes to me with a history of bypass surgery and his LDL is 150, I’ll say, ‘You’d have to take 15 capsules of red yeast rice a day, increasing your risk of toxicity, to get what I could give you with one tablet of rosuvastatin.’”

However, if a patient has had negative experiences with statins and is not eligible for other conventional treatments or is unbendingly opposed to pharmaceutical approaches, and if a standard course of red yeast rice could even modestly reduce that person’s cardiovascular risk, Dr. Gordon says he may give it a shot. 

In those situations, he’ll prescribe a ConsumerLab-vetted supplement that’s been analyzed for monacolin content so that he can accurately titrate the dose (at least, as of the most recent product report). He’ll monitor the patient’s bloodwork to ensure that liver and muscle enzymes remain stable while the patient’s lipid levels (hopefully) drift downward. And he’ll offer the same advice he gives those on statins: medication alone won’t do the trick. “There are people who think they’re protected now, so they can eat cheeseburgers and fries and not worry about it,” he says. “I tell them they need to watch their habits.”

Making A Choice That Works for You

Ultimately, of course, the choice between statins and red yeast rice — like any other medical decision — is up to the individual whose health is at stake. It’s a choice that must emerge from the patient’s unique calculus, not only of risks and benefits, but also hopes and fears, memories and priorities. Accordingly, it’s not always predictable.

Jo Clark’s enthusiasm for red yeast rice lasted about a year. It ended during her annual visit to her cardiologist, when tests showed that her LDL levels had begun inching upward. “She read me the riot act,” Clark recalls. “She said, ‘You’re playing with your life! You don’t know what you’re ingesting!’”          

Clark couldn’t disagree, but she did insist she wasn’t going back on Lipitor. So the doctor agreed to switch her to a different statin, which corrected her cholesterol balance and ended her chest pains, without bringing back her leg cramps. It’s been 20 years, and she says she’s still doing fine.

Despite ongoing debate about possible overprescribing of stains, experts overwhelmingly agree they can be a lifesaver for patients at high risk of cardiovascular disease. Clark takes that principle very much to heart. In her Facebook discussion group on women’s health, she says, “when someone posts, ‘I’ve been reading all this scary stuff about statins,’ I’m the one who jumps on and says, ‘Well, my mom died at 57. If somebody had given her statins, she probably would have made it many decades past that.’” 

Even the most common prescription meds aren’t always trustworthy, as recent reports of defective generic drugs (including atorvastatin) illustrate. But Clark is grateful to have found a medication whose protective effects have been extensively documented and proven over time, and that doesn’t make her scream with pain. For her, the choice was obvious.

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