Hawthorn Berry and Blood Pressure: What the Research Shows

Hawthorn berry (Crataegus) is a traditional heart herb that researchers have studied for blood pressure, and a 2025 meta-analysis of randomized, placebo-controlled trials found modest improvements in adults with high blood pressure. Its flavonoids and procyanidins appear to help blood vessels relax by supporting nitric oxide. Here is what the research says and how to use hawthorn safely.

What is hawthorn berry?

Hawthorn is a thorny shrub of the rose family. Its berries, leaves and flowers have been used in European herbal medicine for centuries to support the heart, and Germany’s Commission E lists hawthorn for cardiovascular use. The main species used are Crataegus monogyna and Crataegus laevigata.

What compounds in hawthorn affect blood vessels?

• Oligomeric procyanidins (OPCs), especially procyanidin B2, strong plant antioxidants.
• Flavonoids such as vitexin-2″-O-rhamnoside, hyperoside and quercetin derivatives.
• Triterpene acids such as oleanolic and ursolic acid.

How does hawthorn work for blood pressure?

Researchers propose several pathways, mostly from laboratory and animal studies:

• Nitric oxide: hawthorn extracts activate endothelial nitric oxide synthase (eNOS) in the lining of blood vessels. Nitric oxide signals the surrounding muscle to relax, which widens the vessel.
• Antioxidant protection: OPCs and flavonoids help counter oxidative stress that can impair blood vessel function.
• Renin-angiotensin system: lab studies have observed mild ACE-inhibitor-like activity.
• Calming effect: a mild sedative action may soften stress-related rises in blood pressure.

What do clinical trials show?

A 2025 meta-analysis by Szikora and colleagues pooled six randomized, placebo-controlled trials with 428 participants. Hawthorn was linked with a meaningful reduction in systolic (top number) blood pressure, while the diastolic results were less consistent. The authors concluded the effect was clinically relevant, but not strong enough for hawthorn to be used on its own instead of standard care. They also noted that the trials were small and used different doses (250–1,200 mg a day) and products.

This is why many people look for formulas that combine hawthorn with complementary botanicals. CardioNitra™ Fulvic Matrix pairs hawthorn with daikon seed, holly leaf, aged garlic and fulvic minerals, and is designed to support healthy blood pressure as part of a heart-healthy lifestyle.

Is hawthorn safe?

In clinical trials, hawthorn was generally well tolerated. The most commonly reported side effects were mild headache, dizziness and stomach upset. Because hawthorn acts on the heart and blood vessels, talk to your doctor before using it if you take heart medication, blood pressure medication or blood thinners. Do not use it during pregnancy or breastfeeding unless your doctor advises it.

Bottom line

Hawthorn berry is one of the best-researched heart herbs, with modest but encouraging clinical results and a plausible mechanism through nitric oxide and antioxidant pathways. It works best as part of a complete routine: healthy eating, less sodium, regular activity, good sleep and regular blood pressure checks.

Frequently asked questions

How long does hawthorn take to work?

In the trials reviewed, effects were measured after several weeks to a few months of daily use.

Can I take hawthorn with blood pressure medication?

Only with your doctor’s approval, because the effects may add together. Never stop or change a prescribed medication on your own.

Is hawthorn berry the same as hawthorn leaf?

Both come from the same plant. Many studies used leaf-and-flower extracts, while the berries are the traditional food and tea form.

Sources

• Szikora Z, et al. Hawthorn (Crataegus spp.) and blood pressure in hypertension: a meta-analysis of randomized placebo-controlled clinical trials. Pharmaceuticals, 2025.
• American Heart Association / American College of Cardiology, 2025 High Blood Pressure Guideline.