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Description
People with problems absorbing nutrients due to Crohns or inflammatory bowel disease, celiac disease, pancreatic disease, or weight loss surgery may need to take B12 in different forms that bypass the gut, like injections or sublingual (under the tongue) supplements
[ [PMID: 37530602] et al

Neurological symptoms can be particularly concerning and may occur even in the absence of anaemia

Breastfeeding women: ~2.8 mcg per day B12 supports a childs growth and neurological development through breastmilk
