Umbilical Cord Blood Stem Cells EFG Finally back in stock!! FOR EXTERNAL USE ONLY (NOT FOR INJECTIONS) Open both vials. Pour stem cell activator serum in freeze dried (lyophilized) umbilical cord. Shake vial and use finger tips to apply to skin. Each vial contains 5ML and can provide many applications. There is a resealable cap. Refrigerate any remaining amount after activation. Comes with two vials, one is stem cells and one is activator.