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| - Last Updated on February 9, 2025 by Dr Priyamvada
Quick Take
A social media post suggests that onion juice can normalise blood pressure at home. We fact checked this claim and found it to be mostly false.
The Claim
According to an Instagram post, taking one tablespoon of onion juice every morning on an empty stomach, followed by a 30-minute wait before eating, will normalise blood pressure. The video also advises taking this onion juice remedy for blood pressure in the evening as well.
Fact Check
Is it true that onion juice can lower blood pressure?
Unlikely. While some early studies suggest that onions contain compounds like quercetin, which may have mild blood pressure-lowering effects, the evidence is not strong or conclusive. A 2018 study showed promising results, but it was conducted on rats, while an older study from 1999 was done on guinea pigs—not humans. Another small study in 2015 involving 70 people found that quercetin could lower systolic blood pressure by about 3.6 mm Hg. However, these studies used concentrated extracts or high doses in supplement form, not the small amount found in a tablespoon of onion juice. Even if onions have potential benefits, the quercetin content in such a small dose is too low to make a real difference. We need more research to confirm any significant effect.
Given this, the current scientific evidence is not strong enough to recommend onion juice as a treatment for high blood pressure. The studies conducted so far are limited in size and scope, and we need more rigorous human research. High blood pressure is a serious condition that requires proper medical management. Relying solely on onion juice could be risky, as it may delay appropriate treatment and put health at risk.
We spoke with Dr Almas Fatma, MBBS, Diploma in Family Medicine, PG in Digital Health, General Physician from Navi Mumbai, for her expert take on onion juice for lowering blood pressure at home. She clarifies, “Onions do contain compounds like quercetin that may have a mild effect on lowering blood pressure. But, the amount found in onion juice is too small to make a real difference. It’s important not to rely on onion juice for managing high blood pressure and to follow proper medical advice instead.”
On a related note, some home remedies claim that onion juice can instantly cure stomach aches, which is misleading. Similarly, the belief that placing onions on the chest can cure cough and bronchitis is false.
Is it safe to consume onion juice on an empty stomach?
Generally, yes. While generally safe for most people in moderation, consuming onion juice on an empty stomach can cause problems for some. Onions contain compounds that can irritate the stomach lining, potentially leading to heartburn, acid reflux, or other digestive discomfort. This is particularly true for people with sensitive stomachs or pre-existing digestive conditions. Additionally, some individuals may be allergic to onions, and in very rare cases, this can trigger a severe allergic reaction known as anaphylaxis.
Should people with high blood pressure stop taking their prescribed medication and rely on onion juice?
Absolutely not. High blood pressure is a serious medical condition that requires proper treatment. Prescribed medications are thoroughly tested to ensure they’re effective and safe. Stopping your medication without consulting a doctor can be very dangerous and may lead to severe complications, like a heart attack or stroke. Onion juice should never replace prescribed medication.
Dr Muskan Thakur, BAMS, Ayurveda Consultant from Indore, says, “No, people with high blood pressure should never stop their prescribed medication to rely on onion juice. High blood pressure is a serious condition that requires proper medical management. From an Ayurvedic perspective, while onions (known as ‘Palandu’) have some properties that may support heart health, they are not a cure. Ayurveda emphasises a holistic approach, including diet, lifestyle changes, and herbal support, but these should complement—not replace—prescribed treatment. Always consult a doctor before making any changes to your medication.”
Similarly, some people suggest that Arjuna bark may support heart health and help lower blood pressure. However, it should only be used as a complementary remedy—not as a substitute for prescribed medication.
THIP Media Take
The claim that onion juice can normalise blood pressure at home is mostly false. Some early research suggests that onions might have a slight effect on blood pressure. However, there’s not enough solid evidence to support the idea that drinking a tablespoon of onion juice twice a day will make a real difference, especially in humans. High blood pressure is a serious condition that needs proper medical care. Relying on unproven remedies like onion juice can be risky. If you’re worried about your blood pressure, talk to a healthcare professional. It is important to never stop taking prescribed medication without medical advice.
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