Hawthorn Berry

📜 Historical Use

Hawthorn grows in temperate regions throughout the world and carries an unusually long list of names, which is part of why it is easy to buy without realising what it is: NCCIH records hawthorne, harthorne, English hawthorn, Mexican hawthorn, raiz de tejocote, tejocote, shanzha and the extract designation WS 1442, across the species Crataegus monogyna, C. mexicana, C. pinnatifida and C. laevigata. Traditionally, NCCIH records it was used for heart disease, digestion, blood circulation, and kidney and bladder problems, and topically for sores, itching and frostbite. The cardiovascular thread is therefore old and continuous, which is rarer than it sounds — many botanicals are marketed today for something their traditional users never claimed. Hawthorn is also, per MSKCC, a fixture of European cardiology practice rather than a recent supplement-industry invention. What has been added recently is the rest: NCCIH describes hawthorn now being promoted for the heart and blood vessels, for weight loss, and for conditions like anxiety. The weight-loss marketing is the newest layer and the one with no evidence behind it at all, and it is also the layer where the tejocote-root products named in the FDA’s 2024 contamination list are sold.

📊 What the Research Shows

Heart failure is the only use with a serious body of trial evidence behind it, and even there the picture is genuinely split. MSKCC reports that a systematic review concluded adjunctive hawthorn improved physiological outcomes and symptom control in patients with chronic heart failure, but that two smaller trials did not find benefit, and that one suggested increased early risk of disease progression. NCCIH states the same conflict more plainly: there is conflicting evidence on the effects of hawthorn in people with heart failure, and a specific preparation of hawthorn (C. oxycantha) may have caused early risk of heart failure progression in patients. MSKCC’s summary judgement is that hawthorn may be helpful in some patients with heart failure but that definitive data on safety and efficacy are needed, and it adds the instruction that matters most: hawthorn should not be used in place of proven conventional therapies for heart failure, and its use should be monitored by the treating physician. Blood pressure is this page’s own headline use, and it is not supported. MSKCC says the data are conflicting and more research is needed. NCCIH does not list hypertension among the uses with quality evidence at all. Everything else is weaker still: NCCIH states there is not enough evidence to know whether hawthorn affects heart disease, angina, abnormal heartbeat or the buildup of plaque in arteries; that it is unclear whether hawthorn affects anxiety; and that there is not any evidence to suggest hawthorn affects weight loss. MSKCC notes clinical studies are lacking for the traditional digestive use.

Take 300-600mg standardized extract (1.8% vitexin-4'-rhamnoside) 3x daily.

May enhance effects of heart medications (digoxin, beta-blockers). Monitor with cardiologist.

⚠️ What happens if taken in excess:

Very high doses may cause excessive drop in blood pressure, leading to dizziness and fainting. Can dangerously enhance the effects of cardiac medications (digoxin, beta-blockers, calcium channel blockers), potentially causing bradycardia and heart failure. May cause nausea and GI upset at high doses.

Hawthorn is a cardiovascular botanical taken overwhelmingly by people already on cardiovascular drugs, which makes this section the most consequential on the page. MSKCC lists antiplatelets and anticoagulants under “do not take if”: an in vitro study suggests hawthorn flowers may inhibit thromboxane A2 biosynthesis, which may increase the side effects of those drugs, though MSKCC states the clinical relevance is undetermined and requires physician monitoring. Digoxin is the interaction most often repeated, and the detail matters. MSKCC reports in vitro data suggesting hawthorn contains alkaloids structurally similar to digoxin that may interfere with its action, while noting one small trial in which coadministration at the studied doses was safe; clinical relevance remains undetermined. NCCIH adds a case report of a falsely elevated digoxin level associated with Crataegus mexicana exposure. Note what that second one describes: not a change in the drug’s effect but a distorted blood test, which can lead a clinician to reduce a dose that did not need reducing. For CYP3A4 substrates, MSKCC reports in vitro evidence that hawthorn may affect their metabolism because it induces CYP3A4 by activating the pregnane X receptor. Induction lowers levels of affected drugs, the opposite direction to the enzyme inhibitors more commonly discussed in herbal interactions. Finally, on the heart-failure progression signal above, NCCIH notes one possibility is that hawthorn might have interacted with drugs the patients were taking.

1. Hawthorn: Usefulness and Safety — National Center for Complementary and Integrative Health NIH NCCIH (2025)[NIH ↗]
2. Hawthorn — Clinical Summary — Memorial Sloan Kettering Cancer Center — Integrative Medicine About Herbs, Botanicals & Other Products (2022)[mskcc ↗]