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Description
Vitamin B12 Deficiency Causes of vitamin B12 deficiency include difficulty absorbing vitamin B12 from food, lack of intrinsic factor (e.g., because of pernicious anemia), surgery in the gastrointestinal tract, prolonged use of certain medications (e.g., metformin or proton pump inhibitors), and dietary deficiency

b12d.org/ B12 Deficiency Info organises occasional B12 Cafe meetings in Leicestershire

Peptides differ in polarity, charge, and hydrophobicity
DHHS/FDA
