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 AkfaLife B12 Vial 10 ml X 10 Oral Vial Akfa Life Vitamin B12 Vials Boost Energy & Neurological Health Pharmaroya Pharmaceutical Cosmetics Industry and Trade, OTC (Over the Counter), Food Supplements, Dermocosmetics, B 12 (Methylcobalamin) Therapy MedClub by Dr Jenn Nature's Bounty Vitamin B 12 Methylcobalamin Tablets, 1000 mcg Walgreens Vitamin B12 Deficiency: Signs, Symptoms, Reasons and Treatment Graphic Era Hospital