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O'Connor WT, Drew KL, Ungerstedt U
Inject too late (at the moment you lie down) and you may fall asleep before the delta-wave promotion has fully engaged, reducing the benefit during the critical first sleep cycle
The B12 shot will continue to work up until the next shot is administered, as the benefits are long-lasting
Typical daily intake targets are about 600 IU per day for most adults, and 800 IU per day after age 70
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