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Horse Chestnut (Aesculus hippocastanum) Seed Extract
A venotonic seed extract with solid (Cochrane-backed) short-term evidence for reducing leg pain, swelling, and heaviness in chronic venous insufficiency.
What the evidence says
Most Horse Chestnut studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 1998–2015.
Based on 4 studies · 1 meta-analysis
Confidence
ModerateHorse Chestnut has an evidence score of 6.8/10 — moderate evidence based on 5 indexed studies, including 2 meta-analyses. A venotonic seed extract with solid (Cochrane-backed) short-term evidence for reducing leg pain, swelling, and heaviness in chronic venous insufficiency. Representative study: PMID 23152216.
The commonly studied dose of Horse Chestnut is 300mg standardized extract twice daily (providing ~50mg aescin per dose; ~100mg aescin/day). Individual needs vary — start at the lower end of the range and adjust based on how you respond.
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Last reviewed June 2026 · evidence from 4 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Horse chestnut (Aesculus hippocastanum) seed extract, standardized to the saponin aescin (escin), is one of the better-evidenced herbal remedies: a Cochrane review found it an effective, well-tolerated short-term treatment for chronic venous insufficiency (CVI) — the leg pain, swelling, heaviness, and itching from poor venous return. Aescin reduces capillary leakage and has a venotonic, anti-edema effect. Note: only the processed extract is used — raw horse chestnut seeds contain toxic esculin and must never be eaten.
Aescin tightens capillary walls, reducing fluid leakage into tissues that causes leg edema.
Improves venous tone and return, countering the pooling of blood in the legs.
Reduces inflammatory mediators and enzymes that degrade the capillary wall.
300mg standardized extract twice daily (providing ~50mg aescin per dose; ~100mg aescin/day)
Take with food
| Form | Type |
|---|---|
| 💊Aescin-standardized, enteric-coated seed extract | Recommended |
| 🧴Topical aescin gel | Alternative |
Never use raw seeds — they contain toxic esculin.
Minimum: 2 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Twice daily with food.
Dose-response data unavailable. The current published research for Horse Chestnut does not provide sufficient dose-specific outcome data to generate reliable dose-response curves.
Refer to the Dosage & Timing section above for recommended dose ranges based on available evidence.
Decreases leg edema (volume, ankle circumference) in venous insufficiency.
Eases the pain, heaviness, and itching of CVI.
Mild stomach upset, dizziness, or headache can occur.
Avoid — insufficient safety data.
Avoid or use only under medical supervision.
Use only with medical supervision.
Aescin may have mild antiplatelet effects — possible additive bleeding risk.
Caution with kidney-stressing drugs; use standardized extract only.
Tip: Take with food; use enteric-coated extract
Tip: Reduce dose
Tip: Discontinue if persistent
The best time to take Horse Chestnut is with meals. Take it with food. Taken with food to reduce GI irritation; enteric-coated forms protect the stomach.
Horse Chestnut is generally safe at recommended doses, with a few precautions worth noting. The most commonly reported side effects are GI upset, dizziness/headache, itching. Use caution if any of these apply to you: Kidney or liver disease; Bleeding disorders or anticoagulant use; Pregnancy and breastfeeding.
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