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The reason signs of vitamin B12 deficiency can take years to appear is that the body stores a large amount of B12 in the liver. These hepatic stores can meet daily needs for a long time—daily requirements are only a few micrograms, while the liver can hold milligrams of B12. Because of this substantial reservoir, even when intake is low or absorption is reduced, it takes many years to deplete those stores enough to produce symptoms. Body recycling of B12 through enterohepatic circulation further slows loss, helping to preserve stores. In contrast, factors like rapid turnover or immediate excretion would lead to much quicker deficiency signs, which is not typical for B12.