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Unlike other vitamins, the absorption of vitamin B12 depends on a protein produced in your stomach, called the intrinsic factor
It works directly on fat cells
It is a component of hemoglobin and myoglobin, proteins in the red blood cells and muscles that store oxygen and deliver it to your brain, other organs, and working muscles, which helps you feel physically and mentally energized
Severe deficiency: Vitamin B12 levels drop to around 50 to 100 pg/mL in this stage
Neurobiol Dis 204:106761
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