Does hibiscus lower blood pressure? What the newest trials found
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Hibiscus may lower blood pressure a little when people drink it regularly for several weeks, and the effect looks largest in people whose numbers start out high. The newest trials are more mixed, so I'd call hibiscus a promising food habit with honest limits.
Hibiscus is one of my favorite ingredients to work with. It's tart and bright, and it turns everything a gorgeous deep pink. It's also in our bars, so I keep a close eye on the blood pressure research. A few new studies came out in 2025, and they add some real nuance to the story you'll see on most wellness sites.
does hibiscus lower blood pressure?
The strongest summary we have is a 2022 review in Nutrition Reviews from researchers at the University of Leeds. They pooled 17 randomized trials, and 819 adults were included in the blood pressure analyses. People who had hibiscus regularly saw their top number (systolic pressure) drop by about 7 points on average compared with controls. The bottom number (diastolic pressure) dropped about three points, which was not statistically significant.
Two details stood out to me. The biggest drops showed up in people whose blood pressure started higher. Also, in four trials that compared hibiscus with blood pressure medication, the results were similar between groups. That sounds exciting, so let me add the caution the authors gave. Those four trials were small and very different from each other, and the authors said more research is needed before anyone can name a dose or a length of time. Hibiscus is a food, and it is no substitute for a medication your doctor prescribed.
The same review found LDL cholesterol dropped by about 6.8 mg/dL. Fasting glucose didn't change.
what the newest hibiscus studies found
This is where it gets interesting. In 2025, a double blind trial in Bangkok published in Complementary Therapies in Medicine randomized 108 adults with extra weight around the middle and mild metabolic syndrome. Half took 1,000 mg a day of hibiscus extract tablets and half took a placebo for 12 weeks, with 84 people included in the final analysis. Blood pressure fell in both groups, and the difference between them was close to zero. The authors think the lifestyle advice everyone received explains part of that drop. Nobody in the trial had a serious side effect, and liver and kidney tests looked the same in both groups.
Also in 2025, the Leeds team ran a small crossover study in Nutritional Neuroscience with 20 adults. Each person had a hibiscus drink one day and a placebo drink another day with a high carbohydrate breakfast. Blood pressure did not change over the next two hours. That fits the bigger picture. Whatever hibiscus does for blood pressure seems to build with regular intake over weeks, and one cup won't move your numbers that morning.
A 2025 systematic review posted as a preprint (meaning it had not finished peer review) gathered 18 studies with 732 participants. The tea trials it describes used about 1.25 to two grams of dried hibiscus per cup, usually two cups a day, for several weeks. The reviewers couldn't pool the results because doses and preparations varied so much.
Hibiscus looks like a lovely daily habit with a modest effect. Keep your expectations in that range.
So where does that leave us? The older pooled data point toward a modest benefit, especially for people with higher numbers. The newest well controlled trial didn't find a difference beyond placebo. Both things can be true, and that's why I'd call hibiscus promising and leave it there.
who should be careful with hibiscus tea
Hibiscus is a common food and drink around the world, and the trials above reported few side effects. Still, some people should check with their doctor before making it a daily habit.
If you're pregnant or trying to get pregnant, skip the concentrated hibiscus until you talk with your doctor. The 2025 systematic review notes that hibiscus caused uterine contractions in isolated rat tissue, which is early lab research and still worth respecting.
If you take blood pressure medication, a diuretic or a statin, ask first. The same review describes animal research where hibiscus changed how a diuretic and a statin behaved in the body, and the authors say human interaction data are lacking. If your blood pressure already runs low, more hibiscus might leave you feeling lightheaded, so go slow.
If you take diabetes medication, ask your doctor too, since hibiscus has been studied for its effects on glucose after meals.
what i would do first
I would get a real baseline. If you're curious about your blood pressure, check it at home for a couple of weeks at about the same time of day and share the numbers with your doctor. Your own readings will tell you far more than any article.
I would treat hibiscus as one piece of a bigger plate. The Leeds review makes the point that results were strongest in people with higher numbers, and the Bangkok trial showed how much lifestyle advice alone moved things in the placebo group. That's a good reminder that the basics carry most of the weight.
I would make it delicious so you actually keep doing it. Here's my iced hibiscus at home. Add two tablespoons of dried organic hibiscus to four cups of just boiled water. Steep for 10 minutes, strain, and chill. Pour it over ice with a squeeze of lime and a few slices of fresh ginger. If you like it sweeter, blend in a pitted date. It keeps in the fridge for about three days.
I would also enjoy hibiscus in food. Our Good Morning Açaí Hibiscus bars are made with organic hibiscus powder alongside dates, chia, flax and puffed quinoa, with 7 grams of fiber per bar. The amount of hibiscus in a bar is much smaller than what the trials used, so I'm not making blood pressure claims about it. It's simply a tasty way to have hibiscus in your morning. If you want the backstory, I wrote about where açaí hibiscus fits in a morning ritual and how this bar fits into eating for your skin.
questions people ask about hibiscus tea and blood pressure
How much hibiscus tea per day lowers blood pressure?
Trials often used about 1.25 to two grams of dried hibiscus per cup, around two cups a day, for several weeks. Researchers still say the best dose and length of time haven't been established.
How fast does hibiscus tea lower blood pressure?
A 2025 study found no change in the two hours after a single hibiscus drink. The benefits seen in earlier trials came from regular intake over weeks.
Can hibiscus tea replace blood pressure medication?
It shouldn't. A few small trials compared the two, and the authors called for more research. Never stop or change a medication without your doctor.
What are the side effects of hibiscus tea?
Recent trials reported few side effects. A 12 week trial saw a handful of people with more frequent urination. People who are pregnant or who take blood pressure medication, diuretics, statins or diabetes medication should talk with their doctor first.
make it a ritual
My favorite way to bring hibiscus into the day is a Good Morning Açaí Hibiscus bar next to a warm cup of Good Morning Cascara Tea, which is made from coffee fruit. Cascara comes from the coffee plant, so ask your doctor about it if you're watching caffeine. Pick a morning pairing you look forward to, and it stops feeling like a chore.
About the author
Yvette Rose is the cofounder and creative director of Joulebody in Malibu. She has spent more than 20 years in product formulation, functional nutrition, hormone health and wellness education, and she writes every post on this blog.
Sources
1. Ellis LR and colleagues. A systematic review and meta analysis of the effects of Hibiscus sabdariffa on blood pressure and cardiometabolic markers. Nutrition Reviews, 2022. Read the review
2. Chaisungnern K and colleagues. Efficacy of Hibiscus sabdariffa extract on metabolic parameters in participants with abdominal obesity and mild metabolic syndrome in Bangkok, Thailand: a double blind, randomized, placebo controlled trial. Complementary Therapies in Medicine, 2025. Read the study
3. Ellis L, Aragón Rojas S, Dye L, Boesch C. Acute effects of Hibiscus sabdariffa on blood pressure and cognitive function. Nutritional Neuroscience, 2025. Read the study
4. Odunaye Badmus SO and colleagues. A systematic review on the efficacy, side effects and interactions of Hibiscus sabdariffa on blood pressure control. medRxiv preprint, 2025. Read the preprint
This is general wellness education, not medical advice. Talk to your doctor before changing medication or starting something new.