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synthesized by certain bacteria Although the intestinal flora of humans is able to synthesize vitamin B 12 , humans are not able to absorb bacteria-generated vitamin B 12 since the location of synthesis (the colon) is too distal from the location of absorption (the small intestine)
Your body can store B12 in the liver for up to 4 years, which is why it can take years to know you have a deficiency within your diet and that your stores are depleted
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Sattar N, Gill JM
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