How to know if we need B12 ?

So i made a recent blood test after 1.5 year on mostly raw vegan and my B12 is ok, in the middle of the average. So since i heard that your colon can  naturally produce B12 but that on the other hand , the body can stock it. How can i know if my body produce it or if i am on my body stockage of B12 ?

In fact i don't want to take B12 if m'y body produce it because this could make him lazy and stop doing though....

Your advice ?

I guess i will have to make another blood test to know...

Thanks .

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