What to Drink When You Have High Blood Pressure

Plain water is the single best default drink for managing high blood pressure, but several other beverages, including beetroot juice, hibiscus tea, green tea, and low-fat milk, have enough research behind them to be worth adding to a daily routine. Just as important as knowing what to reach for is knowing what to limit: alcohol, sugary drinks, and certain herbal teas can quietly push your numbers higher. The picture is more nuanced than a simple “drink this, not that” list, though, because temperature, timing, and even your medications factor in.

Start With Water

Before exploring anything exotic, the most evidence-backed advice is the simplest: drink enough water. When you are even mildly dehydrated, your body releases vasopressin, a hormone that tells the kidneys to conserve water and simultaneously narrows blood vessels. Research on dehydrated adults shows that vasopressin roughly doubles during dehydration and drops back to normal within minutes of drinking water.¹ That rapid hormone shift means consistent hydration keeps one of your body’s built-in blood-pressure-raising systems from being activated unnecessarily.

There is no magic number of glasses. Individual needs depend on body size, climate, activity level, and whether you take a diuretic medication. A practical rule: if your urine is pale yellow most of the day, you are likely well hydrated. Dark, concentrated urine is a sign your body is conserving fluid, and your vasopressin is probably elevated.

Beetroot Juice

Beetroot juice has become one of the more studied “functional” beverages for blood pressure, and the evidence is genuinely encouraging. Beets are rich in dietary nitrate, which your body converts into nitric oxide, a molecule that relaxes and widens blood vessels. A systematic review and meta-analysis of trials in people who already had high blood pressure found that beetroot juice lowered systolic pressure by about 5 mmHg compared to a placebo.² The effect on diastolic pressure was smaller and did not reach statistical significance.

Five points off your systolic reading may not sound dramatic, but it is in the range that medications aim for, and it comes from a glass of juice rather than a pill. Most studies used around 250 ml (about one cup) of beetroot juice daily. The main caveat: beetroot juice is high in natural sugars, so if you are watching your blood sugar as well, concentrated “shots” of beetroot juice (available commercially in smaller volumes) can deliver the nitrate without as much sugar. Your urine and stool will temporarily turn reddish, which is harmless but can be alarming if you are not expecting it.

Hibiscus Tea

Hibiscus tea, made from the dried petals of Hibiscus sabdariffa (the deep red, tart drink sometimes called “agua de Jamaica”), has a long tradition of use for blood pressure in parts of Africa, Central America, and the Caribbean. The science supports the tradition. Hibiscus contains anthocyanins, pigment compounds that appear to inhibit the same enzyme targeted by a common class of blood-pressure drugs (ACE inhibitors), and that also promote relaxation of blood vessel walls through nitric oxide pathways.³⁴

Because hibiscus acts on multiple mechanisms at once, including a mild diuretic effect, it produces modest but reliable reductions in blood pressure in human trials. You can brew it from dried petals steeped in hot water for five to ten minutes. The biggest practical consideration: if you are already taking ACE inhibitors or diuretics, adding hibiscus tea essentially doubles up on the same effect, which could push your pressure too low. Talk to your prescriber before making it a daily habit if you are on those medications.

Green Tea and Black Tea

Tea is something most people already drink, so the question is less “should I start” and more “does this help or hurt?” A meta-analysis pooling results from controlled trials in people with elevated blood pressure found that regular tea drinking lowered systolic pressure by roughly 3 to 5 mmHg and diastolic pressure by about 1 to 2 mmHg.⁵ Green tea showed a slightly stronger effect than black tea, likely because green tea retains more catechins (antioxidant compounds partially broken down during the fermentation process that produces black tea).

The caffeine in tea can temporarily spike your pressure, but the polyphenols appear to outweigh that acute effect over weeks of regular consumption. If you are caffeine-sensitive or drink tea late in the day, decaffeinated green tea still contains the beneficial catechins, just at somewhat lower concentrations. Avoid loading your tea with sugar; sweetened tea beverages from a bottle often have as much sugar as soda, which works against you.

Pomegranate Juice

Pomegranate juice is packed with polyphenols and has shown promise in small clinical studies. In one trial, hypertensive patients who drank a small daily serving of pomegranate juice for two weeks saw about a 5% drop in systolic blood pressure and a 36% reduction in the activity of the angiotensin-converting enzyme (ACE) that tightens blood vessels.⁶ Broader reviews have confirmed that pomegranate juice reduces blood pressure and lipid peroxidation across multiple conditions, including in patients with type 2 diabetes.⁷

The caveat with pomegranate juice is similar to beetroot juice: the sugar content is high. A cup of pure pomegranate juice can contain over 30 grams of sugar. If you choose it, stick to small amounts (four to six ounces), look for 100% juice with no added sweetener, and account for those calories elsewhere in your diet. People on blood thinners like warfarin should check with their doctor, as pomegranate can interact with certain medications.

Tomato Juice

Tomato juice brings a different mechanism to the table: potassium. Potassium helps your kidneys excrete more sodium and acts as a natural vasodilator, widening blood vessels and reducing resistance to blood flow.⁸ A cup of tomato juice supplies roughly 500 mg of potassium, a meaningful chunk of the daily goal. The problem with store-bought tomato juice, and the reason dietitians have traditionally been cautious about recommending it, is sodium. Many brands add substantial amounts of salt. Low-sodium or no-salt-added versions exist and are worth seeking out; they give you the potassium benefit without the sodium penalty.

Milk and Fermented Dairy Drinks

Epidemiological data consistently links regular dairy consumption with lower blood pressure, and for years calcium was assumed to be the reason. More recent research points to a different player: small peptides formed when milk proteins are broken down during digestion or fermentation. These peptides can inhibit ACE, the same enzyme targeted by prescription blood-pressure medications, and modulate other vascular functions.⁹¹⁰

Fermented dairy products like kefir, yogurt drinks, and buttermilk generate more of these bioactive peptides than plain milk, because the bacteria used in fermentation break down casein more extensively. If dairy is part of your diet, low-fat or fat-free versions keep saturated fat intake in check without sacrificing the peptide benefit. People who are lactose intolerant can often tolerate kefir and yogurt (fermentation reduces lactose content), or they can turn to calcium-fortified plant milks, though plant milks have not been studied in the same way for blood-pressure-specific peptides.

Coffee and Caffeine

Coffee is where the advice gets complicated. A single dose of caffeine (roughly one to two cups of coffee) temporarily raises blood pressure, sometimes substantially. In trials of hypertensive individuals, 200 to 300 mg of caffeine produced an average spike of about 8 mmHg systolic and 6 mmHg diastolic, lasting three hours or more.¹¹ That is a meaningful jump, especially if your readings are already borderline.

Here is where the nuance matters: the same review found that over two weeks of daily coffee drinking, the sustained blood-pressure increase disappeared, and large cohort studies show no increased long-term cardiovascular risk from habitual coffee consumption.¹² Tolerance develops. If you already drink coffee every day and your blood pressure is being managed, you probably do not need to quit. If you are a new or sporadic coffee drinker with high blood pressure, be aware that each cup produces an acute spike. Avoid caffeine in the hours before a blood-pressure check, or you will get a falsely elevated reading. And if you are sensitive to caffeine (jittery, anxious, poor sleep), switching to decaf or tea is a painless way to remove one variable from the equation.

What to Cut Back On

Alcohol

Alcohol raises blood pressure through multiple pathways, including effects on the hormone systems that control fluid balance, cortisol secretion, and insulin sensitivity.¹³ The relationship is dose-dependent: the more you drink, the higher the risk. If you choose to drink, keeping it to one standard drink per day (for women) or two (for men) is the conventional guidance for minimizing cardiovascular harm, and even those levels may not be entirely neutral for blood pressure. Heavy or binge drinking is one of the most correctable causes of treatment-resistant hypertension. If your readings are stubbornly high despite medication, cutting alcohol is one of the first lifestyle changes your doctor will recommend.

Sugary Drinks and Energy Drinks

Sodas, sweetened fruit drinks, and energy drinks are three different products but raise pressure through overlapping mechanisms. The fructose in sugary drinks can impair the function of the endothelium (the inner lining of your blood vessels) and raise blood pressure, as demonstrated in experimental models where fructose consumption produced measurable increases in both systolic and diastolic pressure within as little as two weeks.¹⁴ Energy drinks add the problem of high caffeine and guarana content, which increase peripheral vascular resistance and arterial stiffness.¹⁵ For someone managing hypertension, energy drinks are one of the worst choices available: they combine sugar, extreme caffeine doses, and additional stimulant compounds in a single can.

Herbal Teas That Can Backfire

Not all herbal teas are blood-pressure-friendly, and the most notable offender is licorice (liquorice) tea. Licorice root contains glycyrrhizin, a compound that causes the body to retain sodium and lose potassium, mimicking the effect of excess aldosterone. In a documented clinical case, a patient who had been drinking up to six cups of licorice tea per day developed significant hypertension and dangerously low potassium; both resolved completely within two weeks of stopping the tea.¹⁶ Many people switch to licorice tea as a “healthy” alternative to coffee without realizing it can raise blood pressure more than the coffee it replaced. If you enjoy herbal blends, check the ingredients: licorice root turns up in many commercially sold herbal and “detox” teas where you might not expect it.

Chamomile tea, by contrast, appears to work in the opposite direction. Research on chamomile extracts has shown dose-dependent reductions in both systolic and diastolic blood pressure in human volunteers, with some ACE-inhibitory activity similar to hibiscus.¹⁷ The evidence base is still smaller than for hibiscus or green tea, but chamomile is a reasonable choice for an evening cup, especially since it is caffeine-free and mildly sedative.

Grapefruit Juice and Medication Interactions

Grapefruit juice deserves its own warning because the problem is not what it does to your blood pressure directly but what it does to your medications. Compounds in grapefruit inhibit an enzyme in your intestine and liver that breaks down many drugs, including several classes of blood-pressure medication: calcium-channel blockers, certain beta-blockers, and angiotensin receptor blockers among them.¹⁸ When the enzyme is blocked, more of the drug gets absorbed into your bloodstream than intended, effectively turning a normal dose into an overdose. The result can be a dangerous drop in blood pressure, an abnormal heart rhythm, or other side effects.

This interaction is not dose-dependent in a predictable way. A single glass of grapefruit juice can be enough to cause problems, and the enzyme-blocking effect can last for over 24 hours. If you take any blood-pressure medication, read the drug information sheet or ask your pharmacist whether grapefruit is a concern for your specific prescription. When in doubt, swap grapefruit for orange juice, which does not carry the same interaction risk.

Does the Temperature of Your Drink Matter

This is a detail most people never think about, but it can matter. Drinking cold water produces a temporary but notable spike in blood pressure, and the effect is larger than most people would guess. In a controlled study, drinking cold water raised systolic blood pressure by about 23 mmHg in younger adults and about 42 mmHg in older adults, compared to roughly 15 and 22 mmHg with room-temperature water.¹⁹ Cold carbonated water pushed the numbers even higher. The spike was temporary but persisted five to ten minutes into recovery.

For most people, this transient rise is harmless. But if you are older, have poorly controlled hypertension, or are recovering from a stroke or cardiovascular event, chugging ice-cold water could produce a meaningful acute spike. Drinking room-temperature or slightly cool water smooths out that reflex. This finding also has a practical implication for blood-pressure monitoring: if you just drank a large glass of cold water, wait 15 to 20 minutes before checking your blood pressure, or you will get an artificially elevated reading.

Mineral Water and Sodium

Mineral waters vary enormously in their sodium, calcium, magnesium, and bicarbonate content depending on the source. Some people worry that mineral waters high in sodium will raise blood pressure, but a randomized controlled trial comparing a sodium-and-bicarbonate-rich mineral water against a low-mineral control found no difference in blood pressure changes between the groups, even in hypertensive subjects.²⁰ The sodium-rich water did increase sodium excretion in urine, suggesting the kidneys handled the extra sodium efficiently. Aldosterone, a hormone that drives sodium retention and raises blood pressure, actually decreased more in the high-sodium mineral water group.

This is a single study, so it would be premature to declare all mineral waters safe for everyone with hypertension. But it does suggest that the sodium in mineral water, which comes packaged alongside minerals like bicarbonate, calcium, and magnesium, behaves differently in the body than the sodium in processed food. If you enjoy sparkling mineral water, choosing a brand with moderate sodium content and higher calcium and magnesium is a reasonable approach. Checking the label matters: some European mineral waters contain over 1,000 mg of sodium per liter, which is a significant fraction of a daily limit.

Putting a Daily Routine Together

Knowing which individual beverages have evidence behind them is useful, but what does a realistic daily drinking pattern look like for someone managing high blood pressure? The backbone is plain water, spread throughout the day. On top of that, you can rotate in one or two of the evidence-backed options: a cup of hibiscus tea in the morning, a small glass of beetroot juice with lunch, green tea in the afternoon. Variety matters partly because different beverages act through different mechanisms (nitrate from beets, anthocyanins from hibiscus, catechins from green tea, potassium from tomato juice), and partly because no single drink delivers a large enough effect on its own to replace broader dietary changes or medication.

Keep sugary versions of otherwise healthy juices to small portions, skip energy drinks, and treat alcohol as an occasional indulgence rather than a daily fixture. If you take blood-pressure medication, audit your entire beverage routine with your pharmacist at least once. The interaction risk from grapefruit juice is well publicized, but licorice tea and even large amounts of hibiscus can also interfere with therapy in ways that surprise people. A beverage routine works best as one layer in a larger strategy that includes sodium reduction, physical activity, and medication adherence, not as a replacement for any of those.