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insufficient production of intrinsic factor (a protein produced in the stomach lining and needed for the absorption of vitamin B12)

These effects were mediated through downstream activation of transcription factors including c-Fos, c-Jun, and EGR-1, which regulate genes involved in cell cycle progression, extracellular matrix remodelling, and angiogenic signalling

Vitamin B12 deficiency is a condition that occurs when the body lacks sufficient vitamin B12, an essential nutrient crucial for red blood cell production, nerve function, and DNA synthesis

That means you have to get it from food or supplements

It is a water-soluble vitamin, synthesised exclusively by bacteria and found in substantial quantities only in animal foods