Taking hawthorn: timing, duration, course

There is no prescribed time of day for hawthorn. Under "method of administration" the EU monograph of the European Medicines Agency gives exactly two words — oral use — and not a syllable about morning, evening, an empty stomach or a meal. What it does give are amounts, a split across the day, and a rule for when to see a doctor.

The figures circulating online as a "hawthorn course" — two to three times a day, at least six weeks — are genuine, but they come from medicines law. They apply to defined extracts from leaves with flowers, in daily amounts between 240 and 1,750 mg. A supplement tablet with 30 mg of berry extract sits an order of magnitude below that. What actually decides the timing there is the second ingredient: magnesium.

What the monograph says about dosage

The EU monograph on Crataegus spp., folium cum flore (EMA/HMPC/159075/2014, adopted 5 April 2016) lists hawthorn as a traditional herbal medicinal product — used for temporary nervous cardiac complaints after serious conditions have been excluded by a doctor, and for mild symptoms of mental stress and to aid sleep. For every preparation a single dose and a daily dose are given; how often a day it is taken follows from the ratio between the two.

Preparation	Single dose	Daily dose	Hence: doses per day
Herbal tea from comminuted herbal substance	1–2 g in 150 ml	max. 6 g	up to 4
Powdered herbal substance	190–350 mg	570–1,750 mg	3
Dry extract 4–7:1 (methanol 70 %)	80–300 mg	240–900 mg	3
Dry extract 4–7.1:1 (ethanol 45–70 %)	80–450 mg	240–900 mg	2–3
Dry extract 4–5:1 (water)	250 mg	750–1,000 mg	3–4
Tincture 1:3.5–4.5 (ethanol 35 %)	1.68 g	5.1 g	3

So the split is not an invention of advice sites; it stands in the monograph in exactly this form. Commission E had set down the same principle in 1994: 160–900 mg of extract a day, spread over two or three single doses.

Only: these figures belong to a different herbal substance. They refer to leaves with flowers of Crataegus monogyna and C. laevigata — not to berry extracts, and certainly not to Chinese hawthorn. Plant part and species make more difference here than any milligram figure does.

Why the split falls away with a single tablet

Our Hawthorn + magnesium contains per tablet a hawthorn berry extract at a ratio of 20:1, corresponding to 600 mg of berry powder — that is 30 mg of extract — plus 56.25 mg of magnesium. The recommended intake is one tablet a day.

That settles the question of how many portions to divide it into: there is nothing to divide. Put the daily amounts of the monograph next to it and you also see why its intake schemes do not apply here — between 30 mg of extract and 240 to 900 mg lies a factor of eight to thirty, and the preparation is a different one on top of that. A food supplement is not a lower-dosed medicine; it is a food with a plant extract in it.

How long? Two figures from two sets of rules

Two statements circulate about the duration of use, and they seem to contradict each other. Both are correct — they simply answer different questions.

Two weeks (EU monograph). If the complaints persist for more than two weeks while the product is being used, a doctor should be consulted. That is not a maximum duration of use but a safety net: anyone whose complaints are unchanged after two weeks has a problem that belongs in a consulting room. The monograph names explicit warning signs — swollen ankles or legs, pain in the region of the heart radiating into the arms, the upper abdomen or the throat area, or shortness of breath. In those cases: seek medical advice immediately, do not wait and see.

Six weeks (the medicines side). The assessment report accompanying the monograph (EMA/HMPC/159076/2014) records, for preparations on the German market, a treatment duration of at least six weeks; a doctor should decide about continued use after six months at the latest, and long-term use is possible. The same six weeks appear in the Commission E monograph of 1994.

For a food supplement, neither of the two exists. There is no prescribed course length, no mandatory break and no rule about how many weeks in one should stop. "Course" here is an intake scheme you set yourself — not a body of rules. Anyone who wants to take the six weeks as a guide may do so; for the small amount in one tablet, nothing is thereby established.

With or without a meal?

The monograph is silent on this, and comparative studies of "with a meal versus without" do not exist for hawthorn. What does exist is a tolerability argument: in an evaluation of 1,527 reports from the WHO database VigiBase and from the literature (Woerdenbag et al., Pharmaceuticals 2024;17(11):1490, PubMed 39598401), gastrointestinal complaints were the most frequently reported category of undesirable effects — rare overall and mostly minor, but first on the list all the same.

So anyone with a sensitive stomach takes the tablet with a meal. Anyone who tolerates it well on an empty stomach need change nothing. The second reason for the meal is banal and yet the more effective one: eating is a reliable reminder, and with daily preparations regularity is the screw that comes loose most often in everyday life.

Magnesium sets the timing

For the plant extract there is no authorised health claim and therefore no condition of use tied to a point in time. For magnesium there is both: authorised claims under Regulation (EU) No 432/2012 — Magnesium contributes to normal muscle function. and Magnesium contributes to the reduction of tiredness and fatigue. — and reference figures you can calculate with.

The 56.25 mg per tablet correspond to 15 % of the nutrient reference value of 375 mg from Regulation (EU) No 1169/2011. Why it is precisely that figure on the tub is broken down in Magnesium in combination supplements: how much?. Two practical points follow from it for taking the tablet:

Splitting is not needed here. The German Federal Institute for Risk Assessment (BfR) proposes a maximum level of 250 mg of magnesium a day from food supplements and advises spreading that amount over at least two portions across the day — the reason being the laxative effect of larger single amounts. At 56.25 mg that plays no part. It only becomes relevant once a second magnesium product stands beside it; then both portions are added together. What role portion size and regularity play in this is set out in Taking magnesium: morning, evening or split?.

Spacing from certain medicines. Antacids containing magnesium and aluminium markedly reduce the absorption of quinolone antibiotics, because poorly soluble complexes form in the gut (Davies & Maesen, Reviews of Infectious Diseases 1989;11 Suppl 5:S1083–90, PubMed 2570456); the same principle applies to tetracyclines. These data come from the gram range of antacids, not from 56 mg — transferring them to a single tablet is a long way in arithmetic terms. Anyone taking one of those antibiotics, thyroid hormones or bisphosphonates alongside still keeps the two to three hours' spacing that is recommended anyway: it costs nothing.

Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle. Further preparations with this plant extract are in the hawthorn category, single-ingredient magnesium products in the magnesium category.

Who it is not intended for

The monograph explicitly excludes two groups: children and adolescents under 18 for the first indication, children under 12 for the second — in both cases because sound data are lacking. For pregnancy and breastfeeding, safety has not been established; use is not recommended there.

On interactions the monograph records: none reported. The assessment report adds the more honest sentence to it — they have not been investigated so far, an enhancement or reduction of the effect of other medicines cannot be excluded, and with medicines that have a narrow therapeutic range the decision belongs to the individual case. Anyone on long-term medication therefore discusses taking it with their doctor.

Frequently asked questions

Morning or evening? Neither — it is not laid down. There is no study comparing one time of day against another for hawthorn, and the monograph names none. What matters is that the tablet is taken regularly at all; the time of day follows your own routine.

Do I have to take hawthorn as a course with breaks? For a food supplement there is no such requirement. The widespread six weeks come from the medicines field and refer to defined extracts from leaves with flowers in far higher amounts. A mandatory break does not follow from that.

How long until I notice something? This question cannot be answered for a food supplement containing hawthorn, because no health claim is authorised for the plant — so there is no effect for which a time frame could be stated either. The six weeks from the medicines field apply to other preparations in other amounts.

Can I take the tablet together with a magnesium supplement? Arithmetically, 56.25 mg is added to whatever the other product supplies. The BfR maximum level of 250 mg of magnesium a day from food supplements serves as a guide; anyone wanting to stay within it adds both portions together and spreads them over two occasions. With impaired kidney function this question belongs in medical hands.

Sources: European Medicines Agency, European Union herbal monograph on Crataegus spp., folium cum flore, EMA/HMPC/159075/2014 (5 April 2016), sections 4.1, 4.2, 4.4, 4.5 and 4.6 · assessment report on it, EMA/HMPC/159076/2014 (information on preparations on the German market; Commission E monograph 1994) · Woerdenbag HJ et al., Pharmaceuticals 2024;17(11):1490 (PubMed 39598401) · Davies BI, Maesen FP, Reviews of Infectious Diseases 1989;11 Suppl 5:S1083–90 (PubMed 2570456) · Regulation (EU) No 432/2012 · Regulation (EU) No 1169/2011, Annex XIII Part A · German Federal Institute for Risk Assessment, maximum-level proposal for magnesium in food supplements (250 mg/day) · Product declaration Hawthorn + magnesium, 180 tablets.