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It can be corrected simply with oral vitamin B 12 supplement since free vitamin B 12 absorption is not affected.31 Any process that interferes with the release of free vitamin B 12 , such as decreased production of gastric acid and pepsin for releasing vitamin B 12 from food, and impaired secretion of pancreatic enzyme for releasing vitamin B 12 from vitamin B 12 -R-protein complex, can lead to malabsorption

they are not an approved extract taken from the human stomach

But if you happen to injure yourself, typically what your physician will say is rest

Autoimmune condition preventing adequate intrinsic factor production