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 When to recheck vitamin B12 levels after intramuscular vitamin B12 (cobalamin) injection? VITAMIN B12 (Generic) Injectable Solution, 1000 mcg mL, 100 mL vial Easy Refills Chewy Rx Compounded Tirzepatide with B12: Everything You Need to Know Vitamin B12 Injections Energy Boost The Center Medical Should You Take Natural vs. Synthetic B12?