On The Go B12 Injection at enTrust Urgent Care Center Clinic Amazon.com: Life Extension BioActive Folate & Vitamin B12, Promotes Heart, Brain & GI Tract Health, Non GMO, Gluten Free, Vegetarian, 90 Capsules : Everything Else B12 Injections Highlands 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 Vitamin B12 Monthly Injection Dose: Typical Dosages & Administration Methods Liv Hospital