Dietary Supplement 85% 3nB Supports Circulatory Health Suitable for Vegetarians/Vegans Purity & Potency Guaranteed Celery Seed Extract contains 85% 3-n-butylphthalide (3nB), a beneficial compound unique to celery providing natural support for the circulatory system. Manufactured by Natural Factors to ensure safety and potency in accordance with Good Manufacturing Practices (GMP) of the FDA and Health Canada.