Rosemary extract is a concentrated preparation from Rosmarinus officinalis, standardized for rosmarinic acid and other polyphenols. People take it in capsules with a meal, often to support memory and mental clarity. This use draws on a long folk tradition.
A real safety concern exists: rosemary extract can slow blood clotting. Taking it alongside anticoagulant or antiplatelet medications like warfarin or aspirin may raise bleeding risk. Stop using it well before any surgery.
High doses are not advised during pregnancy. Ask your doctor if you take blood thinners or have a bleeding disorder.