Celery seed extract comes from the seeds of *Apium graveolens*. It concentrates compounds like phthalides and flavonoids that support circulation and help blood vessels relax.
Adults take 150 to 500 mg of a standardized extract daily, usually in capsules or liquid form. Swallow it with food to avoid stomach upset. People often reach for it to maintain blood pressure that is already in a healthy range or to ease occasional joint stiffness.
Skip this one during pregnancy. Celery seed may stimulate the uterus. Anyone with kidney disease, anyone on blood pressure medication, and anyone taking blood thinners should check with a doctor first. Stop use well ahead of a scheduled surgery since it can slow clotting.