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Hawthorn

Hawthorn

What the trials found

Hawthorn does not have enough research to reliably improve circulation or lower blood pressure in adults with cardiovascular health concerns.

Median effective dose, most-studied outcomes

Full protocol, 3 outcomes

Risk, worst reported severity

  • worsening heart failure severe
  • serious adverse event severe
  • digoxin major
  • antithrombotic agents moderate
All 12 events and interactions

What hawthorn actually does

Outcome Effect Evidence Dose Time Rank
Early research 2
Lower blood pressure Early data, direction unclear Blood pressure is the force of blood against artery walls, and high levels strain the heart.
moderate 		2 RCTs 2 papers · n=164 1–60 g 1–8 wk —
Increase blood flow Not enough research The circulatory system carries oxygen and nutrients to tissues throughout the body.
trivial 		1 RCT 1 papers · n=42 1000–2500 mg 1 wk —

Effect tiers come from native-unit MCID where available, Cohen's d otherwise.

Protocol

Dose, timing & forms

How much

The small blood pressure and circulation studies used oral hawthorn preparations around 1,000 to 2,500 mg per day for periods ranging from several days to eight weeks.1 Those trials did not show a consistent, statistically significant improvement in either blood pressure number or limb blood flow, so this range is a record of what researchers tested, not an established target dose.1 Avoid escalating the dose in pursuit of a stronger effect, especially if you use cardiovascular medication.

When and how long

Research protocols used hawthorn daily rather than as a one-off dose, with study periods extending up to eight weeks.1 The available evidence does not establish a best morning, evening, with-food, or empty-stomach schedule. If a clinician clears you to use it, follow the product directions consistently and keep the schedule stable so changes in blood pressure, dizziness, or other symptoms are easier to spot.

Forms & standardisation

The evidence does not identify one hawthorn form as best for blood pressure or circulation. Hawthorn extracts used in clinical research are not interchangeable with tea or a generic berry powder, since leaf, flower, and fruit products differ in their plant-compound profile.12 Choose a product that names the Crataegus species and plant part, lists a standardized extract when applicable, and gives a clear amount per serving.

Studied range, by outcome

Outcome Studied range Median effective Duration Evidence
Lower your diastolic pressure 1,000–2,500 mg — 1–8 wk 2 papers
Lower your systolic pressure 1,000–2,500 mg — 1–8 wk 2 papers
Improve limb circulation 1,000–2,500 mg — 1 wk 1 paper

Adverse events and drug interactions

Safety events

worsening heart failure severe
serious adverse event severe
atrioventricular block complete severe
hearing loss moderate
fall moderate
nausea mild
dizziness mild
cardiac complaints mild

Drug interactions

digoxin major increases toxicity
digoxin moderate decreases concentration
antithrombotic agents moderate additive
antihypertensives moderate increases effect
In context

What this is and how it works

  • Blood-pressure trials included 2 studies (n=164); circulation evidence included 1 study (n=42), with unclear direction overall.1
  • Six papers reviewed here spanned 24 outcomes, including circulation, blood pressure, type 2 diabetes, and chronic heart failure.
  • Small, condition-specific trials limit conclusions about hawthorn’s effects in other adults.

Hawthorn comes from thorny Crataegus shrubs and trees. Supplements typically use the leaves, flowers, berries, or a combination of these plant parts, often sold as capsules, tablets, teas, or liquid extracts. Different products can contain very different amounts of the plant compounds, so “hawthorn” on the front label does not guarantee comparable products.

Hawthorn contains flavonoids and procyanidins, plant compounds researchers study for their effects on blood-vessel tone and heart signaling.2 Think of blood vessels as flexible garden hoses: the proposed action involves changing how tightly the hose wall squeezes, which can alter resistance to blood flow. That biological idea does not yet translate into reliable improvements in blood pressure or limb circulation in the available trials.12

Bottom line

Hawthorn is not a strong pick if your goal is reliably lower blood pressure or better circulation. The available trials are small and inconsistent, while the safety stakes are higher for people with heart failure or anyone taking digoxin, blood pressure medicines, or blood-thinning medication.12 If you still want to consider it, get a clinician or pharmacist to review your full medication list first.

Frequently asked

Common questions

Does hawthorn lower blood pressure?

Not reliably based on the available trials. Small studies have tested oral hawthorn for blood pressure, but the results are unclear and did not establish a consistent benefit for either systolic or diastolic pressure.1

How long does hawthorn take to work?

The blood pressure trials ran from a few days to eight weeks, so hawthorn is not an occasional-use supplement. Even within that timeframe, the evidence does not show a dependable blood pressure effect.1

Can you take hawthorn with heart medication?

Do not add hawthorn to heart medication without a clinician or pharmacist reviewing it first. It has important interaction concerns with digoxin, blood pressure medicines, and blood-thinning medicines.

What is hawthorn used for?

Hawthorn is traditionally used for heart and circulation support. Clinical research has explored it for cardiac function and blood pressure, but the evidence for consumer-facing circulation and blood pressure goals remains limited or unclear.12

Sources

Sources

  1. 1. Hawthorn extract randomised blinded placebo controlled trial in patients with type 2 diabetes (2006) ↑
  2. 2. Hawthorn extract for treating chronic heart failure (2008) ↑

Generated August 27, 2026

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