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Vitamin B 12 is bound to intrinsic factor during transit through the stomach
The time when you will notice significant changes in response to B12 supplementation is when you ask how long B12 takes to work
Along with the increase in energy will likely be the increase in cognitive functioning, so you may notice an improvement in your memory and quality of sleep around the same time as the reduction in fatigue
For most healthy adults, the difference is minimal, because both forms restore B12 levels effectively
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