Beet juice is not bad for most people. It can lower blood pressure, improve exercise performance, and delivers a solid nutrient profile. But it does carry real downsides for certain groups: people prone to kidney stones, those on blood pressure medication, and anyone sensitive to high-sugar drinks or digestive issues from fermentable carbohydrates. Whether beet juice helps or hurts you depends almost entirely on your starting point.
Blood Pressure: Benefit or Risk
The most studied benefit of beet juice is its ability to lower blood pressure. Beets are rich in naturally occurring nitrates, which your body converts into nitric oxide, a molecule that relaxes and widens blood vessels. In clinical trials, a single 500 mL serving of beetroot juice lowered systolic blood pressure by 4 to 5 mmHg within six hours, with some individuals seeing drops of over 6 mmHg. That effect is comparable to what some first-line blood pressure medications achieve.
For someone with mildly elevated blood pressure, this is genuinely useful. For someone already taking antihypertensive medication, it introduces a risk. Stacking beet juice on top of blood pressure drugs could push your levels too low, causing dizziness, lightheadedness, or fainting. The same concern applies to nitrate-based medications used for chest pain (angina) and drugs prescribed for pulmonary hypertension. If you take any of these, the blood pressure drop from beet juice isn’t a bonus; it’s a potential problem worth discussing with your prescriber.
Sugar Content Is Higher Than You’d Expect
Beet juice tastes earthy, not sweet, which leads people to assume it’s low in sugar. It isn’t. Processed beetroot juice contains roughly 6 to 9 grams of sugar per 100 mL. A standard 250 mL glass puts you at 15 to 23 grams, and if you’re drinking 500 to 600 mL daily (the amount used in many blood pressure studies), you could hit the World Health Organization’s entire recommended daily sugar limit of 25 to 50 grams from beet juice alone.
This matters most for people managing blood sugar levels or watching calorie intake. If you’re drinking beet juice for its nitrate benefits, concentrated “shots” of 70 to 140 mL deliver the same active compounds in a much smaller volume, keeping the sugar load manageable.
Kidney Stones and Oxalates
Beets are one of the highest-oxalate foods you can eat. Oxalates bind to calcium in the body and, in susceptible people, form calcium oxalate kidney stones, the most common type. Raw silver beet leaves contain over 4,000 mg of oxalates per 100 grams, and while juicing concentrates nutrients, it also concentrates oxalates.
If you’ve never had a kidney stone and have no family history of them, moderate beet juice consumption is unlikely to cause one. But if you’ve passed a calcium oxalate stone before or your doctor has flagged high urinary oxalate levels, beet juice is one of the first things to cut. There’s no safe threshold that’s been established for stone-formers. Staying well hydrated and pairing high-oxalate foods with calcium-rich foods (which binds the oxalate in the gut before it reaches the kidneys) can reduce risk, but for people with a clear history, avoidance is simpler and more reliable.
Digestive Issues and IBS
Beetroot is classified as a high-FODMAP food. FODMAPs are short-chain carbohydrates that pass through the small intestine unabsorbed, reach the colon, draw in water, and get fermented by gut bacteria. The result, for sensitive individuals, is bloating, gas, abdominal pain, and sometimes diarrhea.
If you have irritable bowel syndrome or notice that foods like garlic, onions, or Brussels sprouts bother your stomach, beet juice may trigger the same symptoms. Juicing can actually make this worse because you’re consuming a concentrated dose without the fiber that slows digestion. People following a low-FODMAP elimination diet are typically advised to avoid beets entirely during the restriction phase.
Beeturia: The Harmless Red Scare
About 10 to 14 percent of the general population will notice pink or red urine after drinking beet juice. This is called beeturia, and it’s benign. It can also turn stool dark or reddish, which understandably alarms people who aren’t expecting it. The discoloration comes from betalains, the pigments that give beets their deep red color, passing through your system.
Beeturia is more common in people who are iron deficient or have conditions that affect nutrient absorption, with rates climbing to around 45 percent in people with pernicious anemia. It doesn’t require treatment and resolves on its own once you stop consuming beets. The only real concern is that it can be mistaken for blood in the urine or stool, so knowing you recently had beet juice can save you an unnecessary trip to the emergency room.
Exercise Performance Benefits
The nitrate-to-nitric oxide pathway that lowers blood pressure also improves athletic performance. Higher nitric oxide levels allow muscles to use oxygen more efficiently, reduce the energy cost of exercise, and may increase muscle contraction speed and power. Studies consistently show improvements in both endurance and sprint performance, with the effects most pronounced in recreational athletes and less trained individuals. Elite athletes tend to see smaller gains.
The typical dose used in sports research is 350 to 500 mg of nitrate, usually taken as a concentrated 70 mL beet juice shot about two to three hours before exercise. Some protocols call for daily supplementation over five to seven days leading up to a competition. These doses have been used safely in studies lasting up to four weeks, though there’s no established long-term upper limit for chronic use. The current acceptable daily intake for nitrates is 3.7 mg per kilogram of body weight, which works out to roughly 260 mg for a 70 kg (154 lb) person. Many sports protocols exceed this, apparently without adverse effects in short-term studies.
Who Should Be Cautious
Beet juice is a genuinely healthy drink for people without specific risk factors. But it’s not universally harmless. You should think twice about regular consumption if you fall into any of these categories:
- History of kidney stones: especially calcium oxalate stones, the most common type
- Blood pressure medication: the combined effect could drop your pressure too low
- Nitrate-based heart medications: particularly drugs for angina or pulmonary hypertension
- IBS or FODMAP sensitivity: beet juice can trigger bloating, gas, and abdominal discomfort
- Diabetes or blood sugar concerns: the sugar content adds up quickly at higher volumes
For everyone else, a daily glass or concentrated shot of beet juice is a reasonable addition to your diet, particularly if you’re looking to support cardiovascular health or exercise performance. Keeping portions moderate, around 140 to 250 mL per day, balances the benefits against the sugar load and keeps nitrate intake within well-studied ranges.