benefits of b12 vitamin injections Injection Benefits: Energy, Mood, Metabolism The Benefits of Vitamin Injections
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Nat Rev Endocrinol 12, 1528 (2016)

In short, B12 injections work, but differently based on your starting point: For those with low levels
There are some companies that pasteurise their products and package them in air tight containers so that they will last at least a year or two but then put "short" dates on them to encourage customers to think they are "fresh" and to encourage turnover
I was worried it wasnt real, but I feel the difference