20% Aescin Supports the Integrity of the Veins and Capillaries Herbal Supplement Formulated by Michael Tierra L.Ac, O.M.D Horse chestnut is rich in saponins and flavones, which modern research has shown helps support the normal integrity of the vascular system and connective tissue. Planetary Herbals Horse Chestnut Vein Strength combines a concentrated extract of horse chestnut with other herbs used to support the vascular system, such as witch hazel, butcher's broom and ginkgo.