does injectable b12 expire Hi I bought the 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 How Long Does Vitamin B12

Following the CDC guidance of a 28-day refrigerated-use window, that works out to three 80 mg vials at the low 1.6 mg dose, three vials at the standard 3.2 mg dose, or four vials at the elevated 4.8 mg dose

[1] For example, if a 2 mL dose (full 200 mg thiamine, 200 mg niacinamide) is to be given IV, a nurse might mix it into 50 mL of saline and infuse over 15-30 minutes

Many patients with B12 deficiency, especially those with pernicious anemia, have difficulty clearing cyanide

In contrast, B12 injections go directly into the bloodstream

Such guidelines would help researchers find optimal dosages based on research objectives, desired outcomes, and the characteristics of the experiment