can vitamin b12 injections cause diarrhea Are Shots Safe? Royal Palm Beach Medical Group Vitamin B12 Side Effects Stomach:

FDA staff also said that the evaluation criteria weigh against placing KPV on the list

Direct Dosage: A single B12 injection often delivers a much higher dose directly into the system than a typical daily oral tablet, particularly when considering the limited absorption rate of the latter, contributing to their perceived and actual strength. However, for individuals with mild dietary deficiencies and no underlying absorption problems, high-dose oral B12 supplements (e.g., 1000-2000mcg daily) can sometimes overcome the need for intrinsic factor by allowing for a small amount of passive absorption, eventually raising levels, though this method is less predictable and slower than direct injection

Those with liver or kidney disease might need their doses changed because these conditions can affect how B12 is processed and removed from the body

Some of these assessments are also done independently