Chamomile tea has modest blood-pressure-lowering potential, but it’s not the most powerful herbal option for hypertension. Its main value lies in reducing stress and promoting relaxation, both of which indirectly help keep blood pressure in check. If you’re looking for a single herbal tea with the strongest direct effect on blood pressure, hibiscus tea has more clinical evidence behind it. But chamomile still plays a useful supporting role, especially if stress or poor sleep contribute to your elevated readings.
How Chamomile Affects Blood Vessels
Chamomile contains several active compounds that can relax blood vessel walls. The most studied is apigenin, a plant flavonoid that works by blocking calcium from entering the smooth muscle cells that line your arteries. When less calcium gets into those cells, the muscles relax and the vessels widen, allowing blood to flow more easily with less pressure against the walls.
Researchers testing chamomile compounds on isolated blood vessels found that apigenin and a related flavonoid called luteolin produced slow, steady relaxation in both coronary and splenic arteries. Interestingly, this relaxation didn’t depend on nitric oxide, the signaling molecule behind many blood pressure medications. Instead, it appeared to work through a separate pathway involving calcium channels and a molecule called cyclic GMP, which helps smooth muscle stay relaxed. This means chamomile’s mechanism is distinct from many pharmaceutical approaches, though the real-world effect is considerably gentler.
The Stress and Cortisol Connection
One of chamomile’s clearest benefits for blood pressure is indirect: it lowers stress. Chronic stress keeps your body flooded with cortisol, a hormone that raises blood pressure by tightening blood vessels and telling your kidneys to retain sodium. Over time, persistently elevated cortisol contributes to sustained hypertension.
Cleveland Clinic lists chamomile among the herbs that may help reduce cortisol levels. The calming effect isn’t just subjective. Chamomile’s apigenin binds to the same receptors in the brain that anti-anxiety medications target, promoting genuine physiological relaxation. If your blood pressure spikes during stressful periods or if your readings are higher at the doctor’s office than at home, chamomile tea before bed or during tense moments could help smooth out those peaks. Pairing chamomile with valerian, another calming herb, appears to enhance this stress-related blood pressure benefit.
How Chamomile Compares to Other Teas
Not all herbal teas are equal when it comes to blood pressure. Here’s how the main options stack up:
- Hibiscus tea has the strongest evidence. Clinical trials have shown it can lower systolic blood pressure with an effect comparable to a common prescription medication. The antioxidants in hibiscus directly relax blood vessels and improve blood flow. If lowering blood pressure is your primary goal, hibiscus is the better choice.
- Green tea contains catechins that improve blood vessel function and promote relaxation of artery walls. Regular consumption is associated with lower blood pressure over time, though the caffeine content can temporarily raise it in sensitive individuals.
- Chamomile tea works best as a calming, anti-inflammatory option. Its blood-pressure effects are more about reducing the stress and inflammation that drive hypertension than about directly forcing vessels to dilate. It’s caffeine-free, which makes it a good evening choice.
There’s no reason you have to pick just one. Drinking hibiscus tea during the day for its direct vascular benefits and chamomile in the evening for relaxation and sleep is a reasonable combination.
Getting the Most From Your Cup
How you prepare chamomile tea affects how much of the beneficial compounds end up in your cup. Research on chamomile extraction found that steeping at about 90°C (just below a full boil) for 20 minutes produced the highest concentration of phenolic compounds, the category that includes apigenin and other active flavonoids. Most people steep chamomile for only 3 to 5 minutes, which likely extracts far less.
For a stronger brew, bring water to a boil, let it cool for about 30 seconds, then pour it over your chamomile and cover the cup while it steeps. Covering prevents the volatile compounds from escaping as steam. Twenty minutes is a long steep, and the tea will be noticeably more bitter than a quick cup, so you may want to start at 10 minutes and work up. Loose-leaf chamomile flowers generally release more compounds than tea bags because the larger pieces have more surface area when they expand in water.
Realistic Expectations
Chamomile tea is not a replacement for blood pressure medication if you’ve been prescribed one. The vascular relaxation seen in laboratory studies uses concentrated extracts at doses much higher than what you’d get from a cup or two of tea. The real-world benefit is gentler: a mild, cumulative effect from daily consumption combined with stress reduction and better sleep.
Where chamomile fits best is as part of a broader lifestyle approach. Regular physical activity, reducing sodium, maintaining a healthy weight, and managing stress are the pillars of non-pharmaceutical blood pressure control. A nightly cup of chamomile supports the stress management piece and may contribute a small direct vascular benefit over time. For people with mildly elevated blood pressure (readings in the 120-139/80-89 range), these lifestyle strategies combined can sometimes be enough to bring numbers back to a healthy range without medication. For readings consistently above 140/90, chamomile is a helpful addition but not a standalone solution.