well here's my logic and tell me if its wrong

i read b12 is mostly absorbed in your mouth? and my b12 was normal/ high

and then mag. is absorbed in the kidneys so i was wondering what other vitamins are mostly in the kidneys so i could compare

side note, i took one of those at home uti tests and it said i have leukocytes in my urine. im really leaning towards an infection now but wondering if it could cause numbness in just my hands or is that mostly a separate issue