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doi: 10.1083/jcb.123.2.293

Conditions such as pernicious anaemia (an autoimmune condition affecting intrinsic factor production, which should be confirmed with intrinsic factor antibody testing), Crohn's disease, coeliac disease, and those who have undergone gastric surgery (including bariatric procedures) may have severely impaired B12 absorption

However, published human data remain sparse, and there are currently no large randomized clinical trials demonstrating safety and effectiveness for any approved indication

PLoS One 5:e11065

Womens perception of safety and utilization of herbal remedies during pregnancy in a local government area in Nigeria