Is Beetroot Good for PCOS? What the Nitrate Trials Show

Does Beetroot Actually Lower Blood Pressure?

Yes, and the mechanism is not vague: beetroot is rich in inorganic nitrate, which the body converts to nitrite and then to nitric oxide, a molecule that relaxes blood vessel walls. In the strongest trial on record, 68 patients with hypertension who drank 250 mL of beetroot juice daily for 4 weeks saw clinic blood pressure fall by 7.7/2.4 mmHg, 24-hour ambulatory blood pressure fall by 7.7/5.2 mmHg, and home blood pressure fall by 8.1/3.8 mmHg, compared with a nitrate-free placebo juice — with no loss of effect over the full 4 weeks. A 2022 meta-analysis pooling 7 randomised trials in 218 people with hypertension, using daily doses of 70–250 mL of beetroot juice for 3 to 60 days, found a smaller but still significant average systolic reduction of 4.95 mmHg (95% CI: 1.01–8.88 mmHg); the diastolic effect in that pooled analysis did not reach significance.

Why Does This Matter Specifically for PCOS?

Forty-five percent is how much higher the risk of hypertension is in women with PCOS, pooled across 33 studies in a 2025 systematic review (relative risk 1.45, 95% CI 1.32–1.61), independent of BMI. The same review found PCOS associated with a 28% higher stroke risk and a 41% higher cardiovascular disease risk. This is the reason beetroot belongs in a PCOS-specific conversation at all: not because it treats PCOS, but because PCOS raises exactly the kind of cardiovascular risk that a nitrate-driven, blood-pressure-lowering food has evidence against, independent of reproductive symptoms or weight. The related lipid pattern in PCOS is part of the same cardiometabolic picture beetroot’s evidence speaks to.

Juice or Whole Beet — Which Actually Delivers the Dose?

Two hundred and seventy-two milligrams of nitrate is what a 100 g portion of whole cooked beetroot supplies — measured directly in a controlled trial that tested 100 g, 200 g and 300 g portions against a potassium nitrate solution. That trial found all three whole-beet doses significantly lowered blood pressure in healthy adults under 35, but in adults over 55, only the largest dose — 300 g of beetroot, delivering 816 mg of nitrate — produced a significant effect (systolic −4.8 mmHg, diastolic −5.4 mmHg), matching what the 1,000 mg potassium nitrate reference dose achieved. A separate review of beetroot formulations measured commercial beetroot juice at roughly 4.1 mmol of nitrate per 100 mL — about 254 mg per 100 mL — and concluded that a daily intake above roughly 6.3 mmol (about 390 mg) of nitrate is the threshold associated with a measurable nitric-oxide and blood-pressure effect.

The practical takeaway is arithmetic, not opinion: a single realistic portion of roasted or steamed beetroot — one beet, about 100 g — lands under the dose most trials associate with an effect. Reaching the same nitrate load from whole beet takes 200–300 g in one sitting, roughly two to three beets, which is an unusually large single portion. A 200–250 mL serving of juice reaches it in a drinkable volume, which is exactly why the trials with the clearest, most consistent results used juice rather than whole beet. A free-living trial using 500 g of a beetroot-and-apple juice blend still only found a significant effect in men, with a peak reduction of 4–5 mmHg around 6 hours after drinking it — a reminder that even a juice-based dose does not guarantee an effect for everyone, and that most of the strongest data comes from people who already have hypertension rather than from healthy volunteers.

What About the Glycaemic Worry — Isn’t Beetroot a High-Sugar Vegetable?

It doesn’t hold up against a realistic portion, and this is a fair question to ask of any vegetable before adding it to a PCOS eating pattern. Raw beetroot carries about 9.6 g of total carbohydrate and 6.8 g of sugar per 100 g, according to USDA FoodData Central; cooked beetroot is close to that, at roughly 10 g of carbohydrate and 8 g of sugar per 100 g. Even a generous 150 g portion — more than a typical serving — works out to about 15 g of carbohydrate, a modest load by any standard, regardless of exactly where beetroot sits on a glycaemic-index scale. A 2024 systematic review of 18 randomised trials testing red beetroot products against blood glucose outcomes found the results genuinely mixed — some trials showed a modest glucose-lowering effect, others showed none — and concluded the evidence is not yet consistent enough for a firm claim either way. What is not in dispute is the low carbohydrate density: “root vegetables are high in sugar” is true of some starchy roots, but the actual gram counts for beetroot do not support treating it as a high-glycaemic-load food at realistic portion sizes.

What Is Beeturia, and Should It Worry You?

No — beeturia, the appearance of pink or red urine after eating beetroot, is harmless in the vast majority of people and is caused by betalain pigments passing through digestion largely intact rather than being fully broken down, as described in a clinical reference on the condition. It shows up more often in people who are iron deficient or who have lower stomach acid, because both change how completely the pigment gets metabolised before reaching the kidneys — so beeturia is occasionally a clue toward checking iron status, not a problem in itself. The only real risk is alarm: red or pink urine — or a similarly discoloured stool — can look exactly like blood, and someone unfamiliar with beeturia has gone to an emergency room over it. If you eat beetroot and notice pink urine within about 24 hours, that timing alone is a reasonable clue it’s beeturia; if the colour persists longer than that, or shows up without having eaten beetroot, treat it as a symptom worth checking rather than assuming it’s the vegetable.

What About Oxalates and Kidney Stones?

Beetroot is a genuinely high-oxalate food, and the number is higher than older references suggested. A direct enzymatic re-measurement of common foods found beetroot’s oxalate content roughly five times higher than earlier published figures had reported, putting it in the same high-oxalate category as spinach and rhubarb rather than among low-oxalate vegetables. Oxalate matters specifically for anyone with a personal history of calcium-oxalate kidney stones, since dietary oxalate contributes to the oxalate load the kidneys filter. This is not a reason for most people to avoid beetroot — it is a reason for anyone with a kidney-stone history to raise beetroot and beetroot juice specifically with their clinician before using it regularly for blood pressure, rather than assuming a vegetable is automatically stone-safe.

Who Won’t This Help, or Should Be More Careful?

Older adults may need a meaningfully larger dose to see any effect at all. In the same dose-ranging trial cited above, adults with a mean age of 64 needed the full 300 g whole-beet dose to see a significant blood pressure drop, while adults with a mean age of 27 responded even to the smallest, 100 g dose — the trial’s authors linked this to lower plasma nitrite conversion in the older group, meaning older adults get less nitric oxide out of the same amount of nitrate. People without elevated blood pressure to begin with should not expect a large effect either — most of the clearest trial results come from people who already have hypertension, and the free-living trial in healthy adults found a measurable effect only in men. And because beetroot’s real evidence is cardiovascular, not reproductive or metabolic in the ways PCOS is usually discussed, an insulin-resistance-first approach remains the more direct lever for the glucose and androgen side of PCOS — beetroot is additive to that work, not a substitute for it. The 2023 international PCOS guideline does not name beetroot, or any single food, as a cardiovascular-risk intervention for PCOS — its recommendations focus on overall lifestyle pattern and standard cardiovascular risk screening. The nitrate evidence above comes from cardiology and nutrition trials in the general population, not from PCOS-specific research, which is exactly why this article frames beetroot as a risk lever worth knowing about rather than a guideline-endorsed PCOS treatment.

Is This Different Now That PCOS Is Called PMOS?

No. PCOS was renamed polyendocrine metabolic ovarian syndrome (PMOS) in 2026 by a global consensus process spanning more than 50 organisations, and none of the cardiovascular-risk evidence above changed with the new name. This article uses PCOS because that is still the term most readers search. For the broader glycaemic-load reasoning that also applies to how beetroot fits into a meal, how portion size changes a food’s glycaemic load and the daily sugar ceiling most diet decisions should be checked against cover the same underlying arithmetic used above.