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How long B12 shots take to work depends on your B12 levels when you receive the injection, but you can expect to see improved energy, mental clarity, sleep, and other benefits anywhere from 12-48 hours after treatment
However, there are many topical and systemic treatment options available to reduce symptoms
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Research shows that getting enough magnesium can help increase the time spent in deep, restorative sleep, when the body does its most important repair work (NIH, 2024)
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