Ingredients
Horse Chestnut: The Dose the Trials Actually Used
The best-evidenced herb for leg swelling has one specific number behind it. Measure any product against it. 🦵
Key takeaways
- ~300 mg standardised extract, twice daily, ~50 mg aescin per dose.
- Twice daily matters — aescin has a short half-life.
- Raw horse chestnut seed is toxic; only processed extract is used.
- Bleeding-risk interaction with anticoagulants; stop 2 weeks before surgery.
What the research shows
The studied condition is chronic venous insufficiency — leg vein valves no longer closing efficiently, fluid pooling in the lower leg, and the resulting swelling, heaviness, aching and itching that worsen through the day. Systematic reviews of placebo-controlled trials report reductions in leg volume, in ankle and calf circumference, and in those subjective symptoms.
The effect is real but modest. In several comparisons horse chestnut performed roughly comparably to compression stockings — which tells you both that the herb does something and that a cheap pair of stockings is a serious competitor. The NCCIH summary is a good starting point.
The number to remember 📏
Roughly 300 mg of standardised horse chestnut seed extract, twice daily, delivering about 50 mg of aescin per dose. That is around 600 mg of extract and 100 mg of aescin a day.
Two parts matter equally:
- Standardised. Aescin is the active saponin complex. Extracts are standardised to a stated percentage, commonly 16–20%. Without it, potency is unknown.
- Twice daily. Aescin has a relatively short half-life, which is why trials split the dose. A once-daily product is not reproducing the trial pattern — a point worth noting about Lymph Savior, which is dosed once daily.
Raw seed, side effects and interactions ⚠️
Unprocessed horse chestnut seed contains esculin and is genuinely toxic; poisonings in children who ate conkers are documented. The supplement ingredient is a processed, aescin-standardised extract from which esculin has been removed. Nobody should attempt a home preparation.
In trials, adverse effects were mostly mild: digestive upset, nausea, occasional dizziness or itching. The interactions matter more:
- Anticoagulants and antiplatelets — aescin has antithrombotic activity. The headline interaction.
- Surgery — stop at least two weeks beforehand and tell your team.
- Kidney or liver impairment — take medical advice first.
- Pregnancy and breastfeeding — not established as safe; avoid.
Using the number when shopping 🛒
- Does the product disclose the horse chestnut amount? If not, you cannot evaluate it on paper.
- Is the extract standardised to aescin, and to what percentage?
- Does the daily serving plausibly approach 600 mg of standardised extract, split across the day?
A product answering all three well is rare. One answering none is not necessarily useless — but it is unverifiable, and you should price that uncertainty in. Whatever you take, the mechanical measures still carry the strongest evidence: compression, walking, elevation and salt reduction. See compression vs capsules. 🚶