Are Beets Good for Your Kidneys and Liver?

Beets have stronger evidence behind them for liver support than for kidney protection, though the full picture is more nuanced than a simple yes or no. The liver benefits come primarily from compounds like betaine and betalains, which have been studied in both human trials and animal models for their ability to reduce fat buildup and lower markers of liver stress. The kidney story is thinner and more cautious, with some early lab findings suggesting a protective effect under specific conditions but also a well-known risk factor, oxalates, that makes beets a concern for people prone to kidney stones.

What Beets Bring to the Table

Beets pack an unusual combination of bioactive compounds that most other vegetables don’t deliver in the same concentrations. The headliners are betalains (the pigments responsible for that deep red-purple color, especially betanin), dietary nitrates, and betaine. Alongside those, beets contain polyphenols and various antioxidants that contribute to their overall health profile.¹ Each of these compounds acts through different pathways, which is why the effects on the liver and kidneys don’t line up neatly. The liver story is largely about betaine and betalains working on fat metabolism and detoxification enzymes. The kidney story involves nitrates and their effects on blood flow, plus the complicating factor of oxalates.

Where the Liver Evidence Is Strongest

The most promising research on beets and organ health centers on the liver, particularly for people dealing with non-alcoholic fatty liver disease. A randomized controlled trial comparing beetroot juice, a Mediterranean diet, and a combination of both found that all three interventions lowered key liver enzymes including bilirubin, alkaline phosphatase, and alanine transaminase, while also improving cholesterol and triglyceride levels. The combination of beetroot juice and a Mediterranean diet performed well, and even beetroot juice on its own produced measurable improvements.²

A separate supplementation study found that people with fatty liver who took beetroot powder for 12 weeks saw a drop in serum bilirubin and liver enzyme levels compared to controls. Liver size also decreased. Interestingly, two participants even saw their fatty liver grade improve on ultrasound, with one moving from grade two to grade one and another clearing entirely.³ These are small numbers, and the overall grade change across the full group wasn’t dramatic, but the direction of the findings is consistent with the broader pattern.

What makes these results credible isn’t just the human trials. Animal research adds a layer of mechanistic support. In diabetic rats, beetroot extract reduced fat accumulation in the liver, lowered markers of inflammation and oxidative stress, and activated a gene called PPARα that helps cells burn fat rather than store it. The effects were dose-dependent, with higher doses producing bigger improvements.⁴

How Betaine and Betalains Actually Help the Liver

Two compounds in beets do most of the heavy lifting when it comes to liver protection, and they work through different mechanisms. Betaine is a naturally occurring compound that acts as a methyl donor, meaning it participates in chemical reactions that help the liver process fats and clear harmful byproducts. One of its key jobs is lowering homocysteine, a compound that builds up when methylation pathways stall. In mouse studies, betaine supplementation reversed fat accumulation in the liver by restoring healthy levels of methionine and a related compound called S-adenosylmethionine, while bringing homocysteine back down.⁵

Betaine also plays a role in alcohol-related liver damage. Research has mapped out how it can counteract the cascade of metabolic disruptions that alcohol triggers in liver cells, from restoring methylation balance to reactivating fat-burning pathways that alcohol suppresses.⁶ This doesn’t mean eating beets will undo the damage from heavy drinking, but it does explain why betaine has attracted interest as a potential therapeutic compound for liver conditions.

Betalains work through a different route. The red pigment betanin activates a pathway known as Nrf2, which flips on genes that produce detoxifying and antioxidant enzymes in liver cells. In human liver cell lines, betanin treatment boosted the expression of these protective enzymes, suggesting it could help the liver handle toxic exposures more effectively.⁷ The researchers noted that beetroot juice protected against chemical liver injury in earlier experiments, and the Nrf2 pathway activation offers a plausible explanation for why.

Broadly, betaine supports the liver’s metabolic housekeeping by keeping methylation and fat processing running smoothly, while it also contributes to hydration of cells, antioxidant defense, and cardiovascular health.⁸ Betalains, meanwhile, prime the liver’s built-in detoxification system. Together, they give beets a two-pronged mechanism of liver support that few other common vegetables can match.

What About Hepatic Blood Flow?

One thing beets don’t seem to do is change blood flow to the liver. Given that dietary nitrates are famous for dilating blood vessels and lowering blood pressure, you might assume they’d improve circulation to the liver too. But a double-blind, placebo-controlled trial in both young and older healthy adults found no effect. Despite a clear spike in plasma nitrite levels after drinking beetroot juice, hepatic blood flow, blood sugar, and related metabolic markers stayed the same as in the placebo group.⁹ So the liver benefits of beets seem to be driven by their chemical components rather than any boost in blood delivery.

The Kidney Evidence Is More Limited

If you’re looking for the same strength of evidence on kidney health, you won’t find it yet. The most direct human study tested whether beetroot juice could improve kidney blood flow. In healthy young adults, a single dose of beet juice didn’t change renal blood flow under normal breathing conditions or during a mild stress test that reduced oxygen delivery. Blood velocity and vascular resistance in the kidney’s segmental arteries showed no difference between pre- and post-consumption measurements.¹⁰ This was a single-dose study in young, healthy people, so it doesn’t rule out longer-term effects or benefits in people with kidney problems. But it does suggest that the blood vessel dilation beets are known for doesn’t translate directly to better kidney perfusion in the short term.

There is, however, an intriguing lab finding. A study using human kidney cells exposed to high-glucose conditions, simulating the kind of stress that diabetes puts on the kidneys, found that a water extract from beetroot significantly restored cell survival. At concentrations as low as about 31 micrograms per milliliter, the extract brought cell viability back above 90 percent in cells that were being damaged by excess sugar.¹¹ The researchers concluded that beetroot extract has strong antioxidant and renoprotective activity against diabetes-related kidney cell damage. This is promising, but cell studies are several steps removed from clinical proof. Cells in a dish respond to isolated compounds in ways that may not hold up when those compounds have to survive digestion, reach the kidneys, and interact with the full complexity of a living body.

The honest assessment is that beet’s kidney benefits remain speculative for now. The liver has human trial data and well-mapped mechanisms. The kidneys have a null result for blood flow and a single cell study showing protection under diabetic stress. Researchers are interested, but the work is early-stage.

The Oxalate Problem for Kidney Stone Risk

For people with a history of kidney stones, especially calcium oxalate stones (the most common type), beets are a legitimate concern. Beet varieties contain high concentrations of oxalates, and eating large amounts of high-oxalate foods can increase the risk of stone formation in susceptible individuals.¹² This doesn’t mean beets cause kidney stones in everyone. Most people process oxalates without trouble. But if you’ve been told you form oxalate stones, loading up on beet juice every morning is the kind of thing worth discussing with your doctor.

How you prepare beets matters here. Cooking reduces oxalate levels, and certain fermentation methods can bring them down further. On the other hand, drinking raw beet juice concentrates both the beneficial compounds and the oxalates, which is the trade-off. If kidney stones are a concern, cooked beets eaten in moderate portions are a safer bet than concentrated raw juice.

How Cooking Changes What You Get

Preparation method has a surprisingly large effect on beet’s nutrient profile. Pressure cooking, for instance, significantly reduces oxalates, tannins, and calcium, all of which can inhibit iron absorption or contribute to stone risk. But that same cooking process also slashes some of the compounds you want. Betanin, the main red pigment and a key betalain, dropped by roughly 91 percent in pressure-cooked juice with residue. Nitrate levels fell by about 25 percent, and another betalain called vulgaxanthin decreased by around 32 percent.¹³

This creates a real tension. If you’re eating beets for liver-protective betalains, raw or lightly processed forms deliver far more of those pigments. If you’re worried about oxalates, cooking is the smarter move even though it diminishes some of the upside. There’s no single “best” preparation. The right approach depends on which benefit matters most to you and whether you have any risk factors that make oxalates a concern.

Beets and the Gut Microbiome

A newer line of research connects beets to gut health, which in turn affects both the liver and kidneys through what scientists call the gut-organ axis. The liver receives blood directly from the gut via the portal vein, so whatever the gut produces or fails to filter gets delivered straight to liver cells. Gut inflammation and bacterial imbalances have been linked to worsening liver disease, which makes the gut a relevant player in this story.

A pilot randomized controlled trial in adults with long COVID found that beetroot juice intake positively influenced gut microbiota and reduced markers of inflammation, though it didn’t translate into improved functional outcomes in that particular study.¹⁴ The gut microbiome changes were detectable, even if they didn’t produce the functional improvements the researchers were hoping for.

Interestingly, the microbiome effects of beet consumption may be more pronounced in the mouth than in the intestines. A four-week study of increased nitrate intake from beetroot juice found significant shifts in the oral microbiome, with an increase in Neisseria bacteria and a decrease in Veillonella, but no significant changes in intestinal microbiome composition.¹⁵ The oral shift matters because Neisseria species are nitrate-reducing bacteria. They convert dietary nitrate into nitrite on your tongue, which then gets swallowed and converted to nitric oxide in the stomach and bloodstream. This is actually the main route through which dietary nitrate from beets lowers blood pressure.

The Nitrate-to-Nitric-Oxide Pipeline

This oral bacteria connection is worth understanding because it explains why some people get more benefit from beets than others. When you eat beets or drink beet juice, the nitrates are absorbed and then concentrated in your saliva by your salivary glands. Bacteria on the back of your tongue, particularly Neisseria and Rothia species, reduce that nitrate to nitrite. A controlled study confirmed that nitrate exposure led to a roughly three-fold increase in Neisseria abundance in the mouth within hours, along with a rise in Rothia, suggesting that nitrate acts almost like a prebiotic for these oral bacteria.¹⁵ People who use antiseptic mouthwash regularly may blunt this conversion step, because those products kill the very bacteria needed to start the nitrate-to-nitric oxide process.

While the cardiovascular benefits of this pathway are better studied, the broader point for organ health is that beet’s effects don’t happen in isolation. They depend on your oral microbiome, your gut bacteria, how the beets are prepared, and what other foods and medications you’re taking. A person on blood pressure medication who starts drinking concentrated beet juice daily could end up with blood pressure that drops too low, which is why a pilot study in people with type 2 diabetes temporarily removed participants from blood pressure-lowering medications before testing beet juice.¹⁶

Who Should Be Cautious

Beets are a food, not a drug, and for most people they’re a perfectly healthy addition to the diet. But a few groups should pay attention to quantity and form:

Kidney stone formers: If you’ve had calcium oxalate stones, keep beet portions moderate and favor cooked over raw. Concentrated beet juice delivers a high oxalate load in a small volume.
People on blood pressure medication: The nitrate content in beets can lower blood pressure on top of whatever your medication is already doing. This isn’t dangerous at normal food portions for most people, but daily high-dose beet juice warrants a conversation with your prescriber.
People on blood thinners: Beets contain vitamin K, which interacts with warfarin and similar medications. Again, normal dietary amounts are usually fine, but sudden large increases in beet intake could affect your levels.
Anyone alarmed by red urine: Beeturia, the harmless passage of red or pink urine after eating beets, affects a sizable minority of people and is not a sign of kidney damage. It’s simply unmetabolized betalain pigments passing through. If you’ve never eaten beets before and see red in the toilet, don’t panic.

Beet Juice Versus Whole Beets Versus Supplements

The form matters more than people realize. Most of the clinical trials on liver health used beetroot juice or beetroot powder, not whole roasted beets on a dinner plate. Juice concentrates the active compounds but also concentrates the oxalates and sugars. Whole beets deliver fiber along with the bioactive compounds, which slows sugar absorption and feeds gut bacteria. Supplements vary wildly in quality and concentration, and the evidence behind any specific supplement product is almost always thinner than the evidence behind the whole food or fresh juice used in studies.

If your goal is liver support, the research most directly supports regular intake of beetroot juice, on the order of what was used in the fatty liver trials. If you’re eating beets for general health, whole beets in various preparations give you a broader nutrient package with less risk of overdoing any single component. And if you’re considering a beet supplement, know that the dramatic 91 percent loss of betanin seen in pressure cooking gives you a sense of how sensitive these compounds are to processing. A dried, encapsulated powder that sat on a shelf for months may not deliver what the label promises.¹³