Small studies have found that horse chestnut seed extract is helpful in treating chronic venous insufficiency and is as effective as wearing compression stockings.
There is not enough scientific evidence to support the use of horse chestnut seed, leaf, or bark for any other conditions.
Do not use raw or unprocessed horse chestnut seeds, leaves, bark, or flowers. They contain esculin, which is poisonous. The toxic effect may result in upset stomach or kidney damage. When properly processed, horse chestnut seed extract contains little or no esculin and is considered generally safe when used for short periods of time. However, the extract can cause some side effects, including dizziness, headache, itching, or gastrointestinal upset.
If your symptoms persist or worsen, consult a health care practitioner. If you are pregnant or breast-feeding, consult a health care practitioner before using horse chestnut.
Horse chestnut may increase the anticoagulant or antiplatelet effect of certain medications such as aspirin, warfarin, and clopidogrel. As a result, there may be an increase in risk of bleeding or bruising if they are taken together with horse chestnut.
Because of the blood-thinning effect, you should stop taking horse chestnut 2 weeks before a surgical procedure.
Your health condition may be affected by the use of horse chestnut. Talk to your health care provider before using horse chestnut if you have any of the following diseases or conditions:
- bleeding disorders
- infected or inflamed gastrointestinal tract
- reduced liver function
- reduced kidney function
Horse chestnut should be avoided by people who are allergic to latex.
Before taking any new medications, including natural health products, speak to your physician, pharmacist, or other health care provider. Tell your health care provider about any natural health products you may be taking.