Be sure to record your injection dates, sites used, and any reactions
Even in liquid form, it will still last a year or two past the expiration date, unless it is compromised by mold
It depends on your goals and diet
Here's the TL;DR on vitamin timing: while there is no official medical advice dictating that you should take vitamin supplements at a specific time of day to improve their efficiency, there is quite a lot of research showing that avoiding some vitamin supplements at particular times (or more accurately, with particular meals) can improve absorption, or that taking some vitamins alongside food can reduce the risk of adverse side effects
It's also important to let us know if you have any allergies (especially to cobalt or B12), or if you have Leber's disease, kidney problems, or are pregnant or nursing
Intramuscular B12 Injection Procedure When performing an intramuscular injection, insert and withdraw the needle at a right angle (90 degrees)