Healthy Vascular Function* Plus Horse Chestnut & Hawthorn Extracts NOW® Celery Seed Extract offers a wide array of bioactive compounds including naturally occurring phthalides such as 3-n-butylphthalide (3nB). 3nB is extensively researched for its ability to support vascularhealth, especially within the brain.* This product includes horse chestnut seed extract, which has been long known to support healthy vascular function.* Hawthorn extract with its many phenolic constituents has also been included to complement this formula. Natural color variation may occur in this product.