If your target compound is incompatible with benzyl alcohol and you cannot use a bulk transfer system, you will need to explore other sterile options
I've used up ampoules that are long out of date and have been subjected to fluctuating heat (terrible for wine!) due to being in my car, etc, and haven't noticed any difference
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Absorption and Availability A B12 deficiency can result from a lack of intrinsic factor, a substance needed to absorb B12
The reason for this is that over time, the stomachs ability to secrete enough gastric acid decreases
It has also been used as a second line agent to sulfasalazine to treat people with inflammatory bowel disease such as ulcerative colitis and Crohn's disease