Beet juice is widely promoted for heart health and athletic performance, but it’s not safe for everyone. People with kidney stone history, low blood pressure, irritable bowel syndrome, iron overload conditions, and those taking certain medications should either avoid beet juice entirely or limit it carefully. The reasons vary, but they all come down to the same concentrated compounds that make beet juice beneficial for some people making it genuinely risky for others.
People Prone to Kidney Stones
Beet juice is one of the highest-oxalate beverages you can drink. Lab analyses put beetroot juice at 60 to 70 mg of oxalate per 100 ml, second only to rhubarb nectar. That means a single 500 ml glass delivers 300 to 350 mg of oxalates, a substantial chunk of what most dietary guidelines consider a full day’s limit for stone formers.
Oxalates bind to calcium in your kidneys and form calcium oxalate crystals, which are responsible for roughly 80% of all kidney stones. If you’ve had a calcium oxalate stone before, your risk of forming another one is already elevated. Drinking beet juice regularly can push your oxalate load high enough to trigger a new stone. Even people who haven’t had stones but have been told they excrete high levels of oxalate in their urine should be cautious. The soluble oxalate fraction in beet juice (54 to 65 mg per 100 ml) is especially relevant because soluble oxalates are the form most readily absorbed by the body.
People With Low Blood Pressure
The nitrates in beet juice are what give it its blood-pressure-lowering reputation. Your mouth and stomach convert these nitrates into nitric oxide, which relaxes blood vessel walls and widens them. For someone with high blood pressure, that’s helpful. For someone whose blood pressure already runs low, it can cause dizziness, fainting, or dangerous drops.
In one clinical study of hypertensive postmenopausal women, two out of 15 participants had to be excluded after experiencing an abrupt blood pressure drop and near-fainting during exercise, just 15 minutes into the session. If even people with high blood pressure can experience that reaction, the risk is greater for those starting with readings on the lower end. If your systolic pressure regularly sits below 100 mmHg, or if you already feel lightheaded when standing up quickly, beet juice could amplify those symptoms.
People Taking Blood Pressure or Certain Other Medications
If you take blood pressure-lowering medication, the British Heart Foundation specifically recommends checking with your doctor before drinking beet juice regularly. The nitrate-driven blood pressure drop from beet juice stacks on top of whatever your medication is already doing, potentially pushing your levels too low.
Beyond blood pressure drugs, beet juice contains betanin, its signature red pigment, which inhibits a liver enzyme called CYP3A4 in a dose-dependent way. This enzyme is responsible for breaking down a wide range of medications. When it’s suppressed, those drugs stay in your bloodstream longer and at higher concentrations than intended, increasing the risk of side effects. Medications processed through this pathway include certain blood thinners (like rivaroxaban, apixaban, and edoxaban), some erectile dysfunction drugs, immunosuppressants, and several classes of heart medications. The interaction mechanism is similar to the well-known grapefruit juice warning. If your medication label warns against grapefruit, it’s reasonable to exercise caution with large or regular amounts of beet juice as well.
People With IBS or FODMAP Sensitivity
Beetroot is classified as a high-FODMAP food due to its fructan content. Fructans are short-chain carbohydrates that pass through the small intestine without being fully absorbed. Once they reach the colon, bacteria ferment them, producing gas. They also draw water into the intestine through osmotic activity. For most people this causes nothing noticeable, but for people with irritable bowel syndrome, the combination of gas production and extra fluid in the gut triggers bloating, abdominal pain, flatulence, and diarrhea.
Juicing concentrates these compounds. You’re consuming the fructans from multiple beets in a single glass, without the fiber that would at least slow transit. If you’re following a low-FODMAP diet or have been diagnosed with IBS, beet juice is likely to provoke symptoms. Other high-FODMAP vegetables in the same category include garlic, onions, asparagus, and Brussels sprouts.
People With Iron Overload or Mineral Accumulation Disorders
Beet juice is rich in iron, copper, phosphorus, and magnesium. For most people, that’s a selling point. For people with hemochromatosis, a condition where the body absorbs and stores too much iron, it’s a concern. Excess iron accumulates in the liver and pancreas and can cause serious organ damage over time. Similarly, the copper content could be problematic for people with Wilson’s disease, where copper builds up to toxic levels.
These conditions aren’t rare. Hereditary hemochromatosis affects roughly 1 in 200 people of Northern European descent, and many don’t know they have it until organ damage shows up on lab work. If you’ve been told your iron levels (ferritin or transferrin saturation) are elevated, regular beet juice consumption adds to the problem.
People at Risk for Gout
The oxalates in beet juice don’t only affect your kidneys. They can also raise uric acid levels in the blood. When uric acid gets too high, it crystallizes in joints, causing gout, an intensely painful form of inflammatory arthritis that most often strikes the big toe. If you’ve had gout flares before or have been told your uric acid runs high, limiting beet intake to no more than a half-cup serving of whole beets per day is a common guideline. With juice, you can easily blow past that in a few sips.
People With Diabetes Managing Blood Sugar
Beet juice contains roughly 10 grams of sugar per 150 ml serving, according to the British Heart Foundation. That’s natural sugar, but your pancreas doesn’t distinguish between sugar from beets and sugar from a candy bar. Concentrated beet juice “shots,” which are popular among athletes, often pack even more sugar into a smaller volume.
The UK dietary recommendation is to keep total sugar from fruit and vegetable juices under 30 grams per day. If you have type 2 diabetes, even moderate beet juice consumption counts meaningfully toward that limit, especially if you’re also eating fruit or drinking other juices. The liquid form means the sugar hits your bloodstream faster than it would from eating whole beets, where fiber slows absorption.
A Note on Beeturia
Between 10% and 14% of the general population will notice their urine turning pink or red after drinking beet juice. This is called beeturia, and in most cases it’s harmless, just startling if you’re not expecting it. The pigments responsible (betacyanins) pass through your system and show up in urine and sometimes stool.
What’s worth knowing is that beeturia rates climb significantly in people with iron deficiency or conditions that increase iron absorption in the gut. Among people with pernicious anemia, the rate jumps to 45%. If you consistently notice red or pink urine after eating beets, it may be worth mentioning to your doctor, not because the beeturia itself is dangerous, but because it can signal an underlying absorption issue. It can also mimic blood in the urine and lead to unnecessary alarm or medical testing if you forget what you ate.