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as levels normalise, improved daytime energy may temporarily affect sleep-wake cycles Individual sensitivity : A small subset of people may be more sensitive to changes in B vitamin levels Formulation factors : Some B12 supplements contain additional ingredients that could affect sleepalways check product labels for stimulants like caffeine For the vast majority of people, vitamin B12 supplementation does not cause sleep disturbances when taken as directed

doi:10.1016/S0969-2126(98)00073-2

In fact, there is no indication to use vitamin B12 shots at all when you are not currently deficient in vitamin B12

population consumes less than the recommended amount