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Botanical

Horse Chestnut

Horse chestnut, Aesculus hippocastanum, is a tree whose seed extracts are used in herbal medicine. Escin is their main active constituent.

Also listed as Aesculus hippocastanum, Conker tree, Rosskastanie, venostasin

LongevityHair & SkinCardiovascularBone & JointStress & Mood

What it is studied for

The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.

Oxidative stressLongevityModerateBNo linked study
InflammationSmallCNo linked study
Skin InflammationHair & SkinSmallCNo linked study
Blood pressureCardiovascularSmallCNo linked study
Joint ComfortBone & JointSmallCNo linked study
Chronic StressStress & MoodNo effectFNo linked study
Every rating with its studiesGrouped by health goal, with the publications behind each rating

What is the extract made from?

Horse-chestnut medicines use seed extracts of Aesculus hippocastanum. Escin is a main active constituent used to standardize the extracts in clinical trials. Their action is not fully understood, but research suggests effects on venous tone and fluid passing from small blood vessels into surrounding tissue. 1 2

Why people take it

Essential Health22.6%
Cardiovascular18.7%
Longevity13%
Bone & Joint12.7%
Immune Support7.5%
Energy5.9%

SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.

Questions people ask

Are raw horse chestnuts a natural alternative to capsules?

No. Raw plant parts are unsafe to swallow; the standardized extracts described by NCCIH have a toxic component removed. 3

Should improvement be immediate?

EMA notes that at least four weeks may be needed for symptoms of chronic venous insufficiency to improve. This describes medicinal use, not a guarantee for every product. 1

Does the evidence mean I can replace compression stockings?

Some trials found similar symptom improvements, but the review calls for stronger evidence. NCCIH recommends discussing complementary treatment with the clinicians managing your care. 2 3

Sources

  3. Horse Chestnut National Center for Complementary and Integrative Health