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Abruptly stopping tirzepatide after months of use leads to rapid appetite return and weight regain in most people
Vitamin B12 shots boost your levels quickly, with effects peaking within an hour and lasting for a day as most of the vitamin is flushed out
Can intravenous B12 therapy be used, and when is it indicated
Karbalay-Doust S et al
There are special dosing rules and emergency plans for serious cases
However, your liver can store vitamin B 12 for up to five years, so it's rare for diet to cause this anemia
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