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The absorption process requires adequate stomach acid, intrinsic factor production, and healthy small intestine function
Then, the frequency can be reduced as the patient gets better
The NHS advises that taking up to 2mg (2000 micrograms) daily of vitamin B12 supplements is unlikely to cause harm, with no established upper limit in the UK
This remains anecdotal rather than research-validated but worth considering for those who track cycles
Then, you may be able to switch to B12 supplements
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