Beetroot Juice and Blood Pressure: What the Evidence Shows

One in three adults in England lives with high blood pressure. Most feel nothing. The number sits in the background and raises the long-term risk of stroke, heart attack and kidney disease.

Beetroot juice keeps appearing in gym bags and on supplement shelves across London, sold as a natural way to drop blood pressure and ride harder on the bike. The marketing runs ahead of the science, so this post sticks to what controlled trials show. The short version: a daily beetroot shot produces a small, steady drop in blood pressure and a modest edge in endurance. Neither effect is dramatic. Both are real, and both trace back to one active ingredient.

How beetroot works inside the body

Beetroot is one of the richest dietary sources of inorganic nitrate. After you drink it, bacteria on your tongue turn some of the nitrate into nitrite. Your stomach and blood then convert nitrite into nitric oxide, a small molecule your blood vessels use to relax and widen. Wider vessels lower the pressure your heart pushes against. The same nitric oxide pathway helps muscles use oxygen more efficiently during hard effort, which ties the blood pressure benefit and the performance benefit to a single mechanism.

Leafy greens like rocket and spinach carry nitrate as well. Concentrated beetroot shots pack the dose used in most studies into 70 mL, which makes them the format researchers reach for and the version marketed to athletes.

What the blood pressure trials show

The largest pooled analysis to date combined 22 randomised controlled trials in adults. Beetroot juice lowered systolic blood pressure by 3.55 mmHg and diastolic pressure by 1.32 mmHg against a placebo. The effect grew with dose and duration. Trials using around 500 mL per day cut systolic pressure by 4.78 mmHg, while smaller servings of 70 to 140 mL cut it by 2.37 mmHg. Studies running two weeks or longer reached 5.11 mmHg.

A separate review looked only at people who already had high blood pressure. Across seven trials in 218 patients, daily nitrate-rich beetroot juice lowered systolic pressure by 4.95 mmHg, graded as moderate-quality evidence. Diastolic pressure did not shift reliably in this group. The pattern fits the wider literature: the higher your starting pressure, the larger the potential drop.

Why a few points matter

A drop of three to five mmHg sounds minor. At population scale, the gain adds up. A 2021 analysis in the Lancet pooled 48 drug trials covering more than 344,000 people. Every 5 mmHg reduction in systolic pressure lowered the risk of major cardiovascular events by about 10 percent, whether or not someone already had heart disease. Those trials used medication, not food, so beetroot is no substitute for prescribed treatment. The figure still shows why a small, steady reduction in pressure is worth having, and why the beetroot numbers above sit in a meaningful range rather than a trivial one.

What it does for exercise

Endurance athletes were the first big market for beetroot. The evidence here is softer than the blood pressure data but points the same way. A meta-analysis of 47 studies (McMahon 2017, Sports Medicine) found a small to moderate benefit for time to exhaustion, meaning people kept going longer before stopping. Pure time-trial performance, where you race a set distance, showed a trivial and non-significant change. In plain terms, nitrate helps you last longer at a fixed intensity more than it helps you go faster over a measured course. For a recreational runner or cyclist in London, the practical gain shows up on long, steady efforts rather than on a parkrun personal best. The effect also fades as training level rises, so well-trained athletes tend to see less than beginners.

Resistance and muscular work tell a similar story. One review of 34 trials (Alvares 2021) found a small but significant gain in muscular endurance and a trivial effect on raw strength. Another review of 27 trials in healthy men (Evangelista 2023) reported the clearest benefit when muscles were already fatigued, where strength held up better with nitrate than without. The realistic takeaway: beetroot helps you grind out a few more reps or minutes, not set a personal best.

How much to take, and when

Most trials used around 400 mg of nitrate, roughly 6.4 mmol, which matches one 70 mL concentrated beetroot shot or about 500 mL of standard beetroot juice. For blood pressure, daily use over two weeks or longer worked better than a one-off serving. For exercise, researchers gave the dose two to three hours before training or a race, the window where nitric oxide peaks in the blood. A daily habit covers both goals at once.

Who should be careful

Beetroot juice is food, and for most adults it is safe to drink daily. A few points are worth knowing. Your urine and stool might turn pink or red, a harmless effect called beeturia. People on blood-pressure medication should speak to their GP before adding a daily nitrate source, since the two effects add together. Anyone with a history of kidney stones might want caution, because beetroot is high in oxalate. None of these notes makes beetroot dangerous for the average person, but they matter for the groups affected.

Common mistakes to avoid

The first mistake is expecting drug-sized results. Beetroot trims a few mmHg, not the double-digit drops some marketing implies. The second is the one-off shot the morning of a big event, with no build-up behind it. Blood pressure gains need daily intake over weeks. The third is treating beetroot as a free pass on the rest of the diet. The nitrate effect sits on top of the basics: less salt, more vegetables, regular movement and steady sleep. Used alongside those habits, a daily shot is a small, evidence-backed addition rather than a fix on its own.

Frequently asked questions

The bottom line

Beetroot juice earns its place, with limits. The blood pressure evidence is consistent: a daily nitrate dose lowers systolic pressure by roughly 3 to 5 mmHg, with the largest effect in people who start high and stick with it. The exercise evidence is real but smaller, helping you last longer rather than go faster. None of this replaces the foundations of low salt, more vegetables, regular training and good sleep. As an add-on to those, a daily beetroot shot is a cheap, food-based habit with solid trials behind it.

Sources

1. Bahadoran Z, et al. The Nitrate-Independent Blood Pressure-Lowering Effect of Beetroot Juice: A Systematic Review and Meta-Analysis. Advances in Nutrition, 2017. pubmed.ncbi.nlm.nih.gov/29141968
2. Benjamim CJR, et al. Nitrate Derived From Beetroot Juice Lowers Blood Pressure in Patients With Arterial Hypertension: A Systematic Review and Meta-Analysis. Frontiers in Nutrition, 2022. pubmed.ncbi.nlm.nih.gov/35369064
3. McMahon NF, et al. The Effect of Dietary Nitrate Supplementation on Endurance Exercise Performance in Healthy Adults: A Systematic Review and Meta-Analysis. Sports Medicine, 2017. pubmed.ncbi.nlm.nih.gov/27600147
4. Alvares TS, et al. Effect of dietary nitrate ingestion on muscular performance: a systematic review and meta-analysis of randomized controlled trials. Critical Reviews in Food Science and Nutrition, 2021. pubmed.ncbi.nlm.nih.gov/33554654
5. Evangelista JF, et al. Effects of Beetroot-Based Supplements on Muscular Endurance and Strength in Healthy Male Individuals: A Systematic Review and Meta-Analysis. Journal of the American Nutrition Association, 2023. pubmed.ncbi.nlm.nih.gov/37167368
6. Blood Pressure Lowering Treatment Trialists' Collaboration. Pharmacological blood pressure lowering for primary and secondary prevention of cardiovascular disease across different levels of blood pressure. The Lancet, 2021. pubmed.ncbi.nlm.nih.gov/33933205
7. NHS Digital. Health Survey for England 2022, Adults' health: hypertension. digital.nhs.uk/data-and-information/publications/statistical/health-survey-for-england