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You can read more in our guide on how long it takes for B12 injections to work
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Cochrane Database Syst Rev 2018
Better Sleep Patterns Vitamin B12 plays a role in regulating melatonin, the hormone responsible for sleep cycles
Rapid correction of severe deficiency can occasionally cause hypokalaemia as haematopoiesis resumes, and potassium levels should be monitored in such cases
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