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10.1371/journal.pone.0001308 193

It is good to know what food contains vitamin B12, because if these foods are not a part of your regular diet it may be time for a vitamin B12 injection

Further, even though B12 shots are a good way to remedy B12 deficiency in susceptible people, studies show that B12 supplements do just as good of a job

Cureus 17(10): e94838

When you're deficient, things start going wrong slowly
