Health PSA: vitamin b12, do you have enough? Do you know the signs of deficiency?
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B12 is not produced by the body. It took 10 seconds of Google to figure that out.
Actually, some B12 is synthesizable by gut bacteria. However, the bulk of our B12 stores come from consuming animal products.
I believe that is done by bacteria too far in the digestive tract to be used but yes you are correct.