Hawthorn (Crataegus monogyna)

Quick Summary

Hawthorn (Crataegus monogyna) is a medicinal plant traditionally used for cardiovascular health. Scientific evidence shows potential benefits in lowering blood pressure, improving symptoms of chronic heart failure, and modulating lipid profiles. Hawthorn extracts contain bioactive compounds including polyphenols and flavonoids that may exert antioxidant, anti-inflammatory, and cardioprotective effects. Despite positive findings in some clinical trials and meta-analyses, evidence remains heterogeneous with a need for larger, better-designed studies. Safety data suggest hawthorn products are generally well tolerated with mostly mild adverse effects reported.

What is it?

Hawthorn is a shrub or small tree belonging to the Rosaceae family, commonly found in Europe, North Africa, and Western Asia. The species Crataegus monogyna, also known as common hawthorn, has been used medicinally for centuries, particularly in relation to heart and vascular conditions. Preparations typically include extracts made from the leaves, flowers, and berries.

Traditional Uses

Traditionally, hawthorn has been used to support cardiovascular health. It has been employed in herbal medicine to address symptoms associated with heart disease, such as chest pain, irregular heartbeat, and circulation problems. It is also used as a general tonic to improve heart function and stamina.

Active Compounds

Hawthorn extracts contain multiple bioactive compounds, primarily polyphenols and flavonoids. These compounds are thought to contribute to its antioxidant, anti-inflammatory, and cardioprotective properties. Key constituents include oligomeric procyanidins, flavones, and flavonols, which may influence vascular tone and cardiac function.

Potential Benefits with Evidence Levels

Hypertension: Hawthorn extract has been shown to statistically significantly reduce systolic blood pressure and non-significantly reduce diastolic blood pressure. (Moderate evidence – meta-analysis of 6 randomized placebo-controlled clinical trials with 428 participants over 2-6 months demonstrated clinically significant benefit.) [1]
Chronic Heart Failure: Used as an adjunct treatment, hawthorn extract improved symptoms such as shortness of breath and fatigue, increased exercise tolerance, and improved physiological markers like maximal workload and oxygen consumption indices. (Moderate evidence – systematic review of 14 double-blind randomized placebo-controlled trials involving patients with NYHA class I to III heart failure.) [2] [3]
Hyperlipidemia: Traditional Chinese medicine preparations containing hawthorn may reduce total cholesterol and triglycerides and increase HDL cholesterol; however, they appear less effective than standard drugs in lowering LDL cholesterol. (Low to moderate evidence – meta-analysis of 14 randomized controlled trials with methodological limitations.) [4]
Type 2 Diabetes Mellitus with Carotid Atherosclerosis: Hawthorn combined with Western medicine may improve carotid intima-media thickness, lipid and glucose metabolism, and insulin resistance. (Low to moderate evidence – meta-analysis of 27 RCTs with 2638 patients, though limited by study quality and heterogeneity.) [5]
Hypertensive Heart Disease (Adjuvant Therapy): Selected traditional Chinese medicine botanical drugs including hawthorn combined with Western medicine showed improved blood pressure control and cardiac function parameters. (Low to moderate evidence – meta-analysis of 21 RCTs with 2055 participants, mostly short-term and involving surrogate outcomes.) [6]

Side Effects

Hawthorn-containing products are generally considered safe with mostly minor and atypical adverse reactions reported. Documented side effects include:

Minor gastrointestinal discomfort
Skin and subcutaneous tissue disorders
General disorders such as administration site reactions
Rare and mild cardiac events
Rare nervous system disorders
Occasional nausea and dizziness

No major safety concerns have been identified in clinical trials, but long-term safety data remain limited.

Drug Interactions

Potential herb-drug interactions have been noted mainly via modulation of cytochrome P450 enzymes and P-glycoprotein transporters. Hawthorn may interact with cardiovascular drugs and antiplatelet agents, though direct evidence is limited. Caution is advised, and healthcare providers should be consulted when combining hawthorn with prescription medications.

Who Should Avoid It?

Use of hawthorn should be approached cautiously in individuals with known hypersensitivity to hawthorn or other botanicals from the Rosaceae family. Due to limited safety data, hawthorn is not recommended during pregnancy or breastfeeding without medical supervision. Clinical discretion is advised, especially for those taking multiple medications or with underlying health conditions.

Evidence Limitations

Clinical evidence is often limited by small sample sizes, short duration, and heterogeneous extract preparations, doses, and outcome measures.
Many studies focus on surrogate endpoints rather than hard clinical outcomes.
Most meta-analyses highlight the need for larger, well-designed randomized controlled trials.
Lack of long-term safety data and comprehensive evaluation of herb-drug interactions.
Variability in botanical extract chemotype and lack of standardization confound results.

References

Last Reviewed

June 2024

Informational Disclaimer: This page is for educational purposes only and does not constitute medical advice. Hawthorn should not replace conventional treatment prescribed by a healthcare professional. Consult a qualified healthcare provider before starting any new herbal supplement, especially if you are pregnant, breastfeeding, have existing medical conditions, or are taking other medications.