It doesn't : Vitamin B12 hasn't been proven to help sleep. Well unless you're deficient and have tingles from the neuropathy keeping you awake. But B12 by itself won't do much to help sleep.
Answered 4/25/2016
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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