can you please note the specific list of b vitamins that they checked?
and did the results had like graph that shows in wich level between the norma you are.
i ask this becuse i red that you might have the vitamin in the normal range but still be deficientu.
some people even need to be above the norma in order to be ok.
if your results were totaly fine then all i wrote has nothing to do with our lips.