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Oral B vitamins are subject to significant gastrointestinal absorption variability particularly B12, which requires adequate intrinsic factor for intestinal uptake
Because its a water-soluble vitamin, any excess that isnt used should be flushed from the body and not pose too much risk (not the case with fat-soluble vitamins like vitamin A)
Patients should be instructed to check the medication before each use for any signs of degradation or contamination
