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Some people just dont absorb it very well due to a lack of a substance called intrinsic factor a protein produced in the stomach that binds to B12, helping it to be absorbed into the blood
Products are not for human consumption of any kind
So, when your B12 is low, its no wonder you feel drained
A 4mg dose is 80 units instead of 40
This data can be found at: Ethics statement The studies involving humans were approved by National Center for Health Statistics
Elderly Individuals : The stomach acid formation decreases with age and stomach acid is necessary for the intake of vitamin B12 from the diet
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