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Description
Kornerup LS, Hvas CL, Abild CB (2019) Early changes in vitamin B12 uptake and biomarker status following Roux-en-Y gastric bypass and sleeve gastrectomy

The released vitamin B 12 attaches to R-protein and passes into the duodenum, where R-protein is removed and free vitamin B 12 binds to IF 4 )

This is believed to be due to fewer red blood cells and a fast heartbeat

That's why the Office of Dietary Supplements states that people over 50 should gain most of their B12 from dietary supplements or fortified foods
