Expiration date of selected formulations in room temprature Download Table Do Vitamin B12 Shots Need To Be Refrigerated? Invigor Medical Hi I bought the B12 injectable liquid but there's no use by date on it or how long you have to use it once it's opened. Anyone know the answer? TIA x Lets pinch subcutaneous injection sites! When I said heparin and enoxaparin are exclusively used in the abdomen, I dont mean other meds cant go there. We just generally put anticoagulants in the