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doi:10.1073/pnas.0308082100
Even 100 a day doesnt seem sufficient
You cannot overdose on vitamin B12
A typical approach is 4 to 12 weeks on, then an off-cycle of equivalent length
However, there are many unusual symptoms associated with vitamin B12 deficiency, and most will disappear after taking vitamin B12 long enough to get the stores up to a normal amount and have maintained stable levels of vitamin B12
Comparing H2 Blockers to PPIs in B12 Depletion H2 receptor antagonists and proton pump inhibitors (PPIs) both reduce stomach acid
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