Technically, there are vitamin B injections available in clinics and hospitals, HOWEVER, those are solutions made specifically for injections. You can't just break open a capsule that is meant for ingestion and then inject it into your arm. Vitamin B in gel capsules have relatively high viscosity, and will probably cause a bad reaction in your blood vessels. Granted, this is assuming that you are actually trained in finding a vein and sticking yourself with a needle.
I don't recommend doing this.
Perhaps if you told us what you're trying to achieve, we can offer you a better solution.
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