Heparin Sodium 50 IU and Benzyl Nicotinate work together to reduce pain and inflammation, and promote healing. Heparin is an anticoagulant that prevents new blood clots from forming and dissolves existing ones. Heparin activates antithrombin III, a natural anticoagulant in the body, which stops certain clotting factors from working. Benzyl Nicotinate is a vasodilator that widens blood vessels, increasing blood flow to the affected area. This process, called vasodilation, helps reduce pain and encourages healing.