FACT CHECK: Does hibiscus tea really reduce blood pressure and stress?

CLAIM: An Instagram post claims hibiscus tea is a "clinically proven magic" beverage lowering blood pressure and stress. The post further claims that hibiscus anthocyanins act as "natural ACE inhibitors," preventing vascular constriction, while boosting nitric oxide bioavailability, inducing vasodilation, improving circulation, and downregulating systemic stress. 

FACT: TRUE. Clinical evidence broadly supports hibiscus tea's blood pressure benefits, though the post overstates certainty. Studies confirm a meaningful systolic BP reduction and effects comparable to mild medication, but diastolic improvements are statistically weaker. Acute (single-dose) consumption shows no immediate BP change. Cardiologists largely endorse the mechanism but caution that anthocyanins are far milder than pharmaceutical ACE inhibitors. 

An Instagram account by the name of plantsconnection, with more than three lakh followers, has shared a post claiming that hibiscus tea relaxes arteries, lowers stress and blood pressure. The post has almost 600 likes on the said platform.

The post claims that multiple human clinical trials have demonstrated that Hibiscus sabdariffa tea naturally regulates and lowers both the systolic and diastolic blood pressure.  

“Hibiscus contains a dense profile of Anthocyanins that function as natural ACE inhibitors. By modulating this specific enzymatic pathway, it prevents the vascular constriction that forces your heart to pump harder,” the post reads. 

It adds that hibiscus increases the bioavailability of endothelial nitric oxide, a crucial enzyme present in the inner lining of blood vessels, improving total-body circulation and gently downregulating systemic stress.  

What do studies say?

A 2022 systematic review and meta-analysis published in Nutrition Reviews, which examined 17 randomised controlled trials, found that hibiscus exerted a significant reduction of systolic blood pressure, lowering it by 7.10 mmHg.  

In four studies that pitted hibiscus against conventional blood-pressure medications, the herbal drink demonstrated comparable blood-pressure-lowering effects, with no statistically significant differences observed in systolic or diastolic readings. The review also found hibiscus significantly lowered LDL cholesterol levels compared with other teas and a placebo but had no significant effect on triglycerides, HDL, or fasting blood glucose.  

“Regular consumption of hibiscus could confer reduced cardiovascular disease risk. More studies are warranted to establish an effective dose-response and treatment duration,” the study concluded.  

A 2025 study published in Nutritional Neuroscience examined the acute effects of hibiscus consumption, moving beyond the long-term blood pressure focus of earlier research. The pilot study recruited twenty participants with an average age of 35 and a BMI of 30 in a randomised, placebo-controlled crossover design. Participants received either a hibiscus-containing beverage or an inert placebo alongside a high-carbohydrate breakfast, with metabolic and cognitive measures tracked over a two-hour postprandial period.

Notably, the results complicate the broader 'hibiscus lowers blood pressure' narrative. The hibiscus drink significantly reduced the post-meal glucose spike compared to the placebo at 30 and 45 minutes, but blood pressure did not show any change. 

“This demonstrates that acute hibiscus consumption moderately affects aspects of memory and executive function, coupled with beneficial effects on postprandial glucose response,” the study concluded.  

The experts agree

Dr (Prof) Tarun Kumar, Director and Head of the Medanta Moolchand Heart Centre, noted that hibiscus tea benefits blood pressure, confirming the science while flagging caveats the viral post omitted. 

Dr Kumar acknowledged that "multiple clinical trials indicate that drinking hibiscus tea can reduce both systolic and diastolic blood pressure, acting similarly to mild diuretics or ACE inhibitors," calling it "highly beneficial for individuals managing stage 1 hypertension."  

However, he was careful to distinguish the plant compound from actual medication: "Anthocyanins are not fully equivalent to prescription ACE inhibitor drugs like lisinopril or captopril," he said. He also noted that "their potency and mechanisms differ significantly."  

Dr Kumar added that while plant extracts sometimes show effects "similar to reference drugs" in animal or limited human studies, "the concentrations required to match a pharmaceutical drug are vastly higher than what you can typically absorb from a normal diet." 

Dr Kumar also warned that pregnant or nursing individuals should avoid the tea entirely, and that those with naturally low blood pressure risk "dizziness, fatigue, or fainting." 

Dr Swarup Pal, chief cardiovascular and thoracic surgeon and HOD, Department of CVTS at Gleneagles Hospital, Parel, also endorsed the claims that other experts made.

Dr Pal said, "We can call anthocyanins natural ACE inhibitors," explaining their mechanism as "peripheral vasodilatation," which "decreases the load against which the heart is pumping" and improves cardiac function. While comparing them with medication, he noted that to reach meaningful blood pressure reduction, "one will have to drink at least 3 cups of hibiscus tea a day," but maintained that it "does decrease the blood pressure." 

"It is a very safe thing to have," Dr Pal added, contrasting the tea with ACE inhibitor drugs, which he said "affect the kidneys" and can cause "renal dysfunction." 

This story is done in collaboration with First Check, which is the health journalism vertical of DataLEADS