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Vitamin B12 absorption begins in the mouth but mainly occurs in the stomach and small intestine with the help of intrinsic factor, a protein that helps your body absorb B12. Weight loss surgery results in anatomical changes, such as a smaller stomach, reduced stomach acidity, and changes to the small intestine, that can lead to vitamin B12 malabsorption and decreased intrinsic factor secretion

[22] Blood tests are the most straightforward way to determine if your vitamin B12 levels are within the normal range

How to Calculate Your Specific Dose Accurate dosing is paramount

However, its important to note that the duration of benefits can be influenced by several factors, as discussed in the previous section