Now Foods Vein Supreme™Supports Healthy Vein Function* Supports Vascular Integrity* NOW Vein Supreme is a combination of botanical ingredients for the support of healthy vascular function.* Vein Supreme features Trunorin, a clinically tested extract of prickly ash bark, whose characteristic constituents have been found to promote normal venous function and integrity.* Also included are butcher's broom and horse chestnut seed extract, both of which have long histories of use