Tranexamic acid-13C6 (Cyclocapron-13C6) is 13C labeled Tranexamic acid. Tranexamic acid (cyclocapron), a cyclic analog of lysine, is an orally active antifibrinolytic agent. Tranexamic acid attenuates the effects of severe trauma, inhibits urokinase plasminogen activator and ameliorates dry wrinkles. Tranexamic acid can used for the research of hemostasis [1][2][3][4][5].