Cyanocobalamin - How long can a Vitamin B12 injection be used after it's been drawn up?

Oh, and I should mention that my B12 is a natural supplement sold over the counter at my local grocery store and I have also seen it at my corner pharmacy. It is common and easy to obtain.

My previous comment was not posted, but was held up as "pending approval. I was merely stating that I used to get the injections from my doctor and then she suggested that I give them to myself at home. A vial of cyanocobalamin only cost $6, and lasted for 6 months. I now buy it in liquid form from the supplement section at the grocery store. It is taken sublingually with a dropper. I was diagnosed with a B12 deficiency and now my B12 blood work comes back in normal range. Your injection will be perfectly fine and still be effective for quite a while, don't worry.

If you don't have any gastro problems that prevent it from being absorbed that way. I have Crohns disease and the sublinguals won't absorb like it doesn't absorb from the foods I eat so I'm stuck with the injections which I too do at home. But it wasn't until recently that I found out that they also have a different drug slightly
Different from Cyanocobalamin I can't remember right off hand what it's exact name is because it's the same except without the cyan. Which is supposed to have better results and here's the kicker that I just this year became aware of the cyano in the cyanocobalamin injections is short for the Lil bit of CYANIDE that they use to synthesize the drug!!! I threw me for a loop. Points to ponder. The curse is the cure.