Is Corn Silk Tea Good for High Blood Pressure?

Partly: corn silk tea may help lower high blood pressure alongside prescribed treatment, possibly by increasing salt and water excretion, but its benefit is not well established.

The evidence comes from a small number of studies, most with important limitations. Talk with a clinician before using corn silk tea for blood pressure, especially if you take medication.

Is corn silk tea a proven treatment for high blood pressure?

No. Corn silk tea is not a proven substitute for blood pressure medication or other treatment recommended by your clinician. Some research suggests it might have an additional effect when used with medication, but the quality of that evidence is too limited to establish how much it helps or how safe it is over time.

If you are considering changes to your diet, see the discussion of the best drinks for high blood pressure. A drink should complement, not replace, an established blood pressure management plan.

How might corn silk tea affect blood pressure?

One proposed mechanism is that corn silk may encourage the body to excrete more sodium and water in urine. Changes in fluid and sodium balance can affect blood pressure, but this proposed mechanism does not prove that a typical cup of corn silk tea will reliably lower it.

Corn silk products also vary. A concentrated aqueous extract used in a study is not necessarily equivalent to corn silk tea prepared at home or sold commercially. The amount of active substances in a cup can depend on the product and preparation, so a study result cannot be translated into a dependable household dose.

What does the research say about corn silk tea?

A 2019 systematic review and meta-analysis of five randomized trials included 567 participants with hypertension. It compared corn silk tea plus conventional blood pressure medication with medication alone and found limited evidence that adding the tea might improve blood pressure outcomes.

The review noted poor methodological quality in most trials. It did not establish that corn silk tea alone controls blood pressure, and it did not provide convincing evidence that adding the tea caused fewer adverse events. Longer-term benefits and safety remain uncertain.

A separate 2015 randomized study of corn silk aqueous extract included 20 people with high blood pressure and 20 without systemic hypertension. Researchers reported lower blood pressure after some extract doses during an eight-hour observation period. This was a small, short-term study of an extract, not evidence that ordinary corn silk tea provides lasting blood pressure control.

How should you use corn silk tea?

If you have high blood pressure, ask your clinician whether corn silk tea is appropriate before using it regularly. There is no established amount or brewing strength for treating high blood pressure, so it is not possible to recommend a therapeutic dose.

If your clinician says it is reasonable for you to drink it, choose a product intended for consumption and follow its preparation directions. Those directions are not a proven blood pressure treatment dose. Concentrated corn silk extracts and supplements may differ in strength and should not be assumed to have the same effects as corn silk tea.

Continue taking prescribed medicines as directed, and keep your follow-up appointments. If your clinician recommends home blood pressure monitoring, record the readings and share them rather than judging the tea's effect by how you feel. Do not change or stop medication based on a reading or on drinking corn silk tea.

Who should be careful with corn silk tea?

Talk with a clinician before using corn silk tea if you have kidney disease, heart failure, low blood pressure, or a condition requiring you to limit fluids. Changes in fluid or electrolyte balance may be risky for some people with these conditions.

Also ask about corn silk tea if you take blood pressure medicines, diuretics, diabetes medicines, or blood thinners. Its effects in combination with medicines are not well established. If you are pregnant or breastfeeding, or are considering corn silk tea for a child, seek medical advice first because safety information is limited.

Seek urgent help for a very high reading. If the systolic pressure is higher than 180 mm Hg or the diastolic pressure is higher than 120 mm Hg and you have chest pain, shortness of breath, weakness, vision changes, or difficulty speaking, call emergency services immediately. Do not wait for corn silk tea to work.

If either number is above that threshold without those symptoms, wait at least 1 minute and measure again. If it remains that high, contact a clinician promptly.