Prostacyclins are a type of molecule known as prostaglandins, which are derived from fatty acids. They play a crucial role in the body by helping to regulate blood flow and prevent blood clotting. Prostacyclins are produced by the cells lining blood vessels and act as vasodilators, meaning they help widen blood vessels, improving circulation. In addition to their role in blood flow, prostacyclins also have anti-inflammatory properties. They can inhibit platelet aggregation, which is the clumping together of blood cells that can lead to clot formation. This makes prostacyclins important in cardiovascular health and is why they are studied in relation to conditions like pulmonary hypertension and atherosclerosis.