Circulatory Support Healthy Vascular Function Plus Horse Chestnut & Hawthorn Extracts A Dietary Supplement Vegetarian - Vegan Botanicals/Herbs Family Owned Since 1968 GMP Quality Assured NOW Celery Seed Extract offers a wide array of bioactive compounds including natural phthalides such as 3-n-butylphthalide (3nB). 3nB is extensively researched for its ability to support vascular health, 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.