Nature's Way's standardized Horse Chestnut is a scientifically advanced herbal extract standardized to 20% Aescin and supported by the whole Calendula flower. The Aescin in Horse Chestnut is a powerful saponin that has been suggested to support healthy circulation, especially in the legs. Aescin may promote healthy tone to the veins of the lower extremities.Contains no artificial coloring, artificial flavoring, dairy products, gluten, preservatives, salt, soy, sugar, wheat, or yeast