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Yes, though with awareness
Contraceptive pills can also cause a deficiency, this is thought to be related to a reduction in the vitamin B12- carrying protein (transcobalamin)
doi: 10.1023/a:1025114230714
They are not statements about what would happen in any individual person
The fundamental chemical instability of the peptide chain in a liquid solution at room temperature remains, making refrigeration essential regardless of preservatives
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